Storing the context is useless, because we can't really reuse that
later. For instance in the API RM_DictNext() that returns a
RedisModuleString for the next key iterated, the user should pass the
new context, because we may run the keys of the dictionary in a
different context of the one where the dictionary was created. Also the
dictionary may be created without a context, but we may still demand
automatic memory management for the returned strings while iterating.

Storing the context is useless, because we can't really reuse that
later. For instance in the API RM_DictNext() that returns a
RedisModuleString for the next key iterated, the user should pass the
new context, because we may run the keys of the dictionary in a
different context of the one where the dictionary was created. Also the
dictionary may be created without a context, but we may still demand
automatic memory management for the returned strings while iterating.

Add building memKeyDB with memkind allocator

6.2.6 memkind support

…is missed cases to redis-server. (redis#12322)

Observed that the sanitizer reported memory leak as clean up is not done
before the process termination in negative/following cases:

**- when we passed '--invalid' as option to redis-server.**

```
 -vm:~/mem-leak-issue/redis$ ./src/redis-server --invalid

*** FATAL CONFIG FILE ERROR (Redis 255.255.255) ***
Reading the configuration file, at line 2
>>> 'invalid'
Bad directive or wrong number of arguments

=================================================================
==865778==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 8 byte(s) in 1 object(s) allocated from:
    #0 0x7f0985f65867 in __interceptor_malloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:145
    #1 0x558ec86686ec in ztrymalloc_usable_internal /home/ubuntu/mem-leak-issue/redis/src/zmalloc.c:117
    pmem#2 0x558ec86686ec in ztrymalloc_usable /home/ubuntu/mem-leak-issue/redis/src/zmalloc.c:135
    pmem#3 0x558ec86686ec in ztryrealloc_usable_internal /home/ubuntu/mem-leak-issue/redis/src/zmalloc.c:276
    pmem#4 0x558ec86686ec in zrealloc /home/ubuntu/mem-leak-issue/redis/src/zmalloc.c:327
    pmem#5 0x558ec865dd7e in sdssplitargs /home/ubuntu/mem-leak-issue/redis/src/sds.c:1172
    pmem#6 0x558ec87a1be7 in loadServerConfigFromString /home/ubuntu/mem-leak-issue/redis/src/config.c:472
    pmem#7 0x558ec87a13b3 in loadServerConfig /home/ubuntu/mem-leak-issue/redis/src/config.c:718
    pmem#8 0x558ec85e6f15 in main /home/ubuntu/mem-leak-issue/redis/src/server.c:7258
    pmem#9 0x7f09856e5d8f in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58

SUMMARY: AddressSanitizer: 8 byte(s) leaked in 1 allocation(s).

```

**- when we pass '--port' as option and missed to add port number to redis-server.**

```
vm:~/mem-leak-issue/redis$ ./src/redis-server --port

*** FATAL CONFIG FILE ERROR (Redis 255.255.255) ***
Reading the configuration file, at line 2
>>> 'port'
wrong number of arguments

=================================================================
==865846==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 8 byte(s) in 1 object(s) allocated from:
    #0 0x7fdcdbb1f867 in __interceptor_malloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:145
    #1 0x557e8b04f6ec in ztrymalloc_usable_internal /home/ubuntu/mem-leak-issue/redis/src/zmalloc.c:117
    pmem#2 0x557e8b04f6ec in ztrymalloc_usable /home/ubuntu/mem-leak-issue/redis/src/zmalloc.c:135
    pmem#3 0x557e8b04f6ec in ztryrealloc_usable_internal /home/ubuntu/mem-leak-issue/redis/src/zmalloc.c:276
    pmem#4 0x557e8b04f6ec in zrealloc /home/ubuntu/mem-leak-issue/redis/src/zmalloc.c:327
    pmem#5 0x557e8b044d7e in sdssplitargs /home/ubuntu/mem-leak-issue/redis/src/sds.c:1172
    pmem#6 0x557e8b188be7 in loadServerConfigFromString /home/ubuntu/mem-leak-issue/redis/src/config.c:472
    pmem#7 0x557e8b1883b3 in loadServerConfig /home/ubuntu/mem-leak-issue/redis/src/config.c:718
    pmem#8 0x557e8afcdf15 in main /home/ubuntu/mem-leak-issue/redis/src/server.c:7258
    pmem#9 0x7fdcdb29fd8f in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58

Indirect leak of 10 byte(s) in 1 object(s) allocated from:
    #0 0x7fdcdbb1fc18 in __interceptor_realloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:164
    #1 0x557e8b04f9aa in ztryrealloc_usable_internal /home/ubuntu/mem-leak-issue/redis/src/zmalloc.c:287
    pmem#2 0x557e8b04f9aa in ztryrealloc_usable /home/ubuntu/mem-leak-issue/redis/src/zmalloc.c:317
    pmem#3 0x557e8b04f9aa in zrealloc_usable /home/ubuntu/mem-leak-issue/redis/src/zmalloc.c:342
    pmem#4 0x557e8b033f90 in _sdsMakeRoomFor /home/ubuntu/mem-leak-issue/redis/src/sds.c:271
    pmem#5 0x557e8b033f90 in sdsMakeRoomFor /home/ubuntu/mem-leak-issue/redis/src/sds.c:295
    pmem#6 0x557e8b033f90 in sdscatlen /home/ubuntu/mem-leak-issue/redis/src/sds.c:486
    pmem#7 0x557e8b044e1f in sdssplitargs /home/ubuntu/mem-leak-issue/redis/src/sds.c:1165
    pmem#8 0x557e8b188be7 in loadServerConfigFromString /home/ubuntu/mem-leak-issue/redis/src/config.c:472
    pmem#9 0x557e8b1883b3 in loadServerConfig /home/ubuntu/mem-leak-issue/redis/src/config.c:718
    pmem#10 0x557e8afcdf15 in main /home/ubuntu/mem-leak-issue/redis/src/server.c:7258
    pmem#11 0x7fdcdb29fd8f in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58

SUMMARY: AddressSanitizer: 18 byte(s) leaked in 2 allocation(s).

```

As part analysis found that the sdsfreesplitres is not called when this condition checks are being hit.

Output after the fix:


```
vm:~/mem-leak-issue/redis$ ./src/redis-server --invalid

*** FATAL CONFIG FILE ERROR (Redis 255.255.255) ***
Reading the configuration file, at line 2
>>> 'invalid'
Bad directive or wrong number of arguments
vm:~/mem-leak-issue/redis$

===========================================
vm:~/mem-leak-issue/redis$ ./src/redis-server --jdhg

*** FATAL CONFIG FILE ERROR (Redis 255.255.255) ***
Reading the configuration file, at line 2
>>> 'jdhg'
Bad directive or wrong number of arguments

---------------------------------------------------------------------------
vm:~/mem-leak-issue/redis$ ./src/redis-server --port

*** FATAL CONFIG FILE ERROR (Redis 255.255.255) ***
Reading the configuration file, at line 2
>>> 'port'
wrong number of arguments
```

Co-authored-by: Oran Agra <[email protected]>