dovecot horked on {7.1.0,latest} versions.

Horked is a technical termed for broken :)

Seriously though -- Dovecot configuration works appropriately up to version `7.0.1` and before. Upgrading to the `latest` or `release-v7.1.0` image results in dovecot not starting on docker-mailserver, and consequently rejecting IMAP connections.

Using the same configuration on images up to 7.0.1 works appropriately.

**Expectations**: A working configuration from 7.0.1 should work in 7.0.1+, unless explicit changes are called out in the [Announcements section](https://github.com/tomav/docker-mailserver#announcements).

## Context
Pretty standard postfix/dovecot setup using imap/ssl w/ letsencrypt, dmarc, dkim, etc.

docker-compose.yml (redacted and paths simplified):
```yaml
version: "3"

networks:
  mail:
    driver: bridge
    ipam:
      config:
      - subnet: {MAIL NET}/24
  db_db:
    external: true

services:
  mail:
    image: tvial/docker-mailserver:release-v7.0.1
    restart: "always"
    stop_grace_period: "1m"
    networks:
      mail:
        ipv4_address: {MAIL IP}
    ports:
      - "25:25/tcp"
      - "587:587/tcp"
      - "993:993/tcp"
    hostname: "mail"
    domainname: "{REDACTED}"
    container_name: "mail"
    environment:
      - "DEFAULT_RELAY_HOST=''"
      - "DMS_DEBUG=1"
      - "DOVECOT_MAILBOX_FORMAT=maildir"
      - "ENABLE_CLAMAV=0"
      - "ENABLE_ELK_FORWARDER=0"
      - "ENABLE_FAIL2BAN=0"
      - "ENABLE_FETCHMAIL=0"
      - "ENABLE_LDAP=''"
      - "ENABLE_MANAGESIEVE=1"
      - "ENABLE_POP3=''"
      - "ENABLE_POSTFIX_VIRTUAL_TRANSPORT=''"
      - "ENABLE_POSTGREY=1"
      - "ENABLE_QUOTAS=0"
      - "ENABLE_SASLAUTHD=0"
      - "ENABLE_SPAMASSASSIN=1"
      - "ENABLE_SRS=1"
      - "LOGROTATE_INTERVAL=weekly"
      - "LOGWATCH_INTERVAL=weekly"
      - "ONE_DIR=1"
      - "PERMIT_DOCKER=host"
      - "PFLOGSUMM_TRIGGER=logrotate"
      - "POSTFIX_DAGENT=''"
      - "POSTFIX_INET_PROTOCOLS=ipv4"
      - "POSTFIX_MAILBOX_SIZE_LIMIT=0"
      - "POSTFIX_MESSAGE_SIZE_LIMIT=10480000"
      - "POSTGREY_AUTO_WHITELIST_CLIENTS=0"
      - "POSTGREY_DELAY=300"
      - "POSTGREY_MAX_AGE=35"
      - "POSTGREY_TEXT=Delayed by postgrey"
      - "POSTMASTER_ADDRESS=postmaster@{REDACTED}"
      - "POSTSCREEN_ACTION=enforce"
      - "RELAY_HOST=''"
      - "SA_KILL=6.31"
      - "SA_SPAM_SUBJECT=***SPAM***"
      - "SA_TAG2=6.31"
      - "SA_TAG=3.0"
      - "SASL_PASSWD=''"
      - "SASLAUTHD_MECH_OPTIONS=''"
      - "SASLAUTHD_MECHANISMS=''"
      - "SMTP_ONLY=''"
      - "SPOOF_PROTECTION=1"
      - "SRS_EXCLUDE_DOMAINS=''"
      - "SRS_SENDER_CLASSES=envelope_sender,header_sender"
      - "SSL_TYPE=letsencrypt"
      - "TLS_LEVEL=modern"
      - "TZ=America/Los_Angeles"
      - "VIRUSMAILS_DELETE_DELAY=7"
    volumes:
      - "/d/mail:/var/mail"
      - "/d/config:/tmp/docker-mailserver"
      - "/d/90-sieve.conf:/etc/dovecot/conf.d/90-sieve.conf"
      - "/d/letsencrypt:/etc/letsencrypt:ro"
      - "/var/log/docker/mail:/var/log/mail"
      - "/etc/localtime:/etc/localtime:ro"
```

IMAP/SSL works fine, can login without issue (and all versions before this).
```bash
$ openssl s_client -starttls imap -connect mail.{REDACTED}:993
CONNECTED(00000005)
```

Dovecot is running on the server:
```bash
# ps -ef
UID         PID   PPID  C STIME TTY          TIME CMD
root          1      0  1 23:05 ?        00:00:00 /usr/bin/python2 /usr/bin/supervisord -c /etc/supervisor/supervisord.conf
root          8      1  0 23:05 ?        00:00:00 /bin/bash /usr/local/bin/start-mailserver.sh
root        457      0  0 23:05 pts/0    00:00:00 /bin/sh
root        525      1  0 23:05 ?        00:00:00 /usr/sbin/cron -f
root        527      1  0 23:05 ?        00:00:00 /usr/sbin/rsyslogd -n
root        533      1  0 23:05 ?        00:00:00 /usr/sbin/dovecot -F -c /etc/dovecot/dovecot.conf
dovecot     536    533  0 23:05 ?        00:00:00 dovecot/anvil
root        537    533  0 23:05 ?        00:00:00 dovecot/log
root        538    533  0 23:05 ?        00:00:00 dovecot/config
opendkim    540      1  0 23:05 ?        00:00:00 /usr/sbin/opendkim -f
opendkim    542    540  0 23:05 ?        00:00:00 /usr/sbin/opendkim -f
opendma+    548      1  0 23:05 ?        00:00:00 /usr/sbin/opendmarc -f -p inet:8893@localhost -P /var/run/opendmarc/opendmarc.pid
postgrey    556      1  1 23:05 ?        00:00:00 postgrey --inet=127.0.0.1:10023 --syslog-facility=mail --delay=300 --max-age=35 --auto-whitelist-clients=0 --g
root        558      1  0 23:05 ?        00:00:00 bash /usr/local/bin/postfix-wrapper.sh
amavis      567      1 16 23:05 ?        00:00:01 /usr/sbin/amavisd-new (master)
root        569      8  0 23:05 ?        00:00:00 tail -fn 0 /var/log/mail/mail.log
postsrsd    661      1  0 23:05 ?        00:00:00 /usr/sbin/postsrsd -f 10001 -r 10002 -d {REDACTED} -s /etc/postsrsd.secret -a = -n 4 -N 4 -u postsrsd -p /var/r
root       1206      1  0 23:05 ?        00:00:00 /usr/lib/postfix/sbin/master
postfix    1208   1206  0 23:05 ?        00:00:00 pickup -l -t fifo -u -c -o content_filter= -o receive_override_options=no_header_body_checks
postfix    1209   1206  0 23:05 ?        00:00:00 qmgr -l -t unix -u
amavis     1210    567  0 23:05 ?        00:00:00 /usr/sbin/amavisd-new (virgin child)
amavis     1211    567  0 23:05 ?        00:00:00 /usr/sbin/amavisd-new (virgin child)
root       1214    558  0 23:05 ?        00:00:00 sleep 5
root       1215    457  0 23:05 pts/0    00:00:00 ps -ef
```

### *What* is affected by this bug?
Upgrading beyond `7.0.1` without any changes causes dovecot **not** to run, and therefore, IMAP/SSL to fail.

docker-compose.yml (same as above, just version bump):
```yaml
...

services:
  mail:
    image: tvial/docker-mailserver:release-v7.1.0

...
```

IMAP/SSL fails.
```bash
$ openssl s_client -starttls imap -connect mail.{REDACTED}:993
140671805964736:error:0200206F:system library:connect:Connection refused:../crypto/bio/b_sock2.c:110:
140671805964736:error:2008A067:BIO routines:BIO_connect:connect error:../crypto/bio/b_sock2.c:111:
connect:errno=111
```

Dovecot is **not** running on the server:
```bash
# ps -ef
UID         PID   PPID  C STIME TTY          TIME CMD
root          1      0  2 23:03 ?        00:00:00 /usr/bin/python2 /usr/bin/supervisord -c /etc/supervisor/supervisord.conf
root          8      1  0 23:03 ?        00:00:00 /bin/bash /usr/local/bin/start-mailserver.sh
root        552      1  0 23:03 ?        00:00:00 /usr/sbin/cron -f
root        554      1  0 23:03 ?        00:00:00 /usr/sbin/rsyslogd -n
opendkim    558      1  0 23:03 ?        00:00:00 /usr/sbin/opendkim -f
opendkim    560    558  0 23:03 ?        00:00:00 /usr/sbin/opendkim -f
opendma+    566      1  0 23:03 ?        00:00:00 /usr/sbin/opendmarc -f -p inet:8893@localhost -P /var/run/opendmarc/opendmarc.pid
postgrey    574      1  3 23:03 ?        00:00:00 postgrey --inet=127.0.0.1:10023 --syslog-facility=mail --delay=300 --max-age=35 --auto-whitelist-clients=0 --g
root        576      1  0 23:03 ?        00:00:00 bash /usr/local/bin/postfix-wrapper.sh
amavis      585      1 44 23:03 ?        00:00:01 /usr/sbin/amavisd-new (master)
root        587      8  0 23:03 ?        00:00:00 tail -fn 0 /var/log/mail/mail.log
root        596      0  1 23:03 pts/0    00:00:00 /bin/sh
postsrsd    626      1  0 23:03 ?        00:00:00 /usr/sbin/postsrsd -f 10001 -r 10002 -d {REDACTED} -s /etc/postsrsd.secret -a = -n 4 -N 4 -u postsrsd -p /var/r
amavis     1141    585  0 23:04 ?        00:00:00 /usr/sbin/amavisd-new (virgin child)
amavis     1142    585  0 23:04 ?        00:00:00 /usr/sbin/amavisd-new (virgin child)
root       1225      1  0 23:04 ?        00:00:00 /usr/lib/postfix/sbin/master
root       1226    576  0 23:04 ?        00:00:00 sleep 5
postfix    1227   1225  0 23:04 ?        00:00:00 pickup -l -t fifo -u -c -o content_filter= -o receive_override_options=no_header_body_checks
postfix    1228   1225  0 23:04 ?        00:00:00 qmgr -l -t unix -u
root       1229    596  0 23:04 pts/0    00:00:00 ps -ef
```

roundcube (web UI using IMAP/SSL) is not happy either:
/var/log/syslog:
```bash
Oct 12 20:18:47 {SERVER} roundcube[7483]: errors: <eb34b0a6> IMAP Error: Login failed for {USER} against {REDACTED} from {GATEWAY IP}(X-Real-IP:
 {CLIENT IP},X-Forwarded-For: {CLIENT IP}). Could not connect to ssl://{REDACTED}:993: Unknown reason in /var/www/html/program/lib/Roundcube/rcube_imap.php on line 200 (POST /?_task=login&_action=login)
```

### *When* does this occur?
Any version beyond `7.0.1`

## *How* do we replicate the issue?
See above for replication. I can provide additional files for postfix conf and dovecot sieve, but that doesn't seem to be the issue.

## Actual Behavior
IMAP/SSL logins fail. Dovecot not running on the server.

## Expected behavior (i.e. solution)
**Expectations**: A working configuration from 7.0.1 should work in 7.0.1+, unless explicit changes are called out in the [Announcements section](https://github.com/tomav/docker-mailserver#announcements).

## Your Environment
* Amount of RAM available: 128GB
* Mailserver version used:
   * working: release-v7.0.0, release-v7.0.1
   * non-working: release-v7.1.0, latest
* Docker version used: Docker version 19.03.13, build 4484c46d9d
* Environment settings relevant to the config: See config.
* Any relevant stack traces ("Full trace" preferred):

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Uh oh!

dovecot horked on {7.1.0,latest} versions. #1647

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Uh oh!

dovecot horked on {7.1.0,latest} versions. #1647

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Context

What is affected by this bug?

When does this occur?

How do we replicate the issue?

Actual Behavior

Expected behavior (i.e. solution)

Your Environment

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