reflect.Value.Set using unaddressable value

---------------------------------------------------
BUG REPORT INFORMATION
---------------------------------------------------
**Description**

We recently split our docker-compose.yml file into multiple yaml files and upgraded to v18.03 to take advantage of the added native support for this as per https://github.com/docker/cli/pull/569/files

When deploying with the following command, we get an error and our stack fails to deploy.

```
docker stack deploy -c ../base-services.yml -c base-services.override.yaml -c ../kmp-services.yml -c kmp-services.override.yml -c ../monitoring.yml -c monitoring.override.yml kmp-staging
```

Error:
```
panic: reflect: reflect.Value.Set using unaddressable value
```

The problem was related to having a network defined in our yaml files. When we removed this we didn't see this error any more. 

Seems like a better error could be shown here

```
 docker stack deploy -c ../base-services.yml -c base-services.override.yaml -c ../kmp-services.yml -c kmp-services.override.yml -c ../monitoring.yml -c monitoring.override.yml kmp-staging
```


**Steps to reproduce the issue:**
1.
2.
3.

**Describe the results you received:**

```
[root@awssparkmaster01 staging]# export TAG=staging; docker stack deploy -c ../base-services.yml -c base-services.override.yaml -c ../kmp-services.yml -c kmp-services.override.yml -c ../monitoring.yml -c monitoring.override.yml kmp-staging
panic: reflect: reflect.Value.Set using unaddressable value

goroutine 1 [running]:
reflect.flag.mustBeAssignable(0x97)
        /usr/local/go/src/reflect/value.go:228 +0x17d
reflect.Value.Set(0x1556e40, 0xc42053f7b8, 0x97, 0x1556e40, 0xc4205d7f00, 0x97)
        /usr/local/go/src/reflect/value.go:1351 +0x2f
github.com/docker/cli/vendor/github.com/imdario/mergo.deepMerge(0x1556e40, 0xc42053f7b8, 0x97, 0x1556e40, 0xc42053f738, 0x97, 0xc4204b6c30, 0x3, 0xc4205d7e80, 0x0, ...)
        /go/src/github.com/docker/cli/vendor/github.com/imdario/mergo/merge.go:133 +0x152e
github.com/docker/cli/vendor/github.com/imdario/mergo.deepMerge(0x1689a20, 0xc42053f7a8, 0x99, 0x1689a20, 0xc42053f728, 0x99, 0xc4204b6c30, 0x2, 0xc4205d7e80, 0x0, ...)
        /go/src/github.com/docker/cli/vendor/github.com/imdario/mergo/merge.go:68 +0x1465
github.com/docker/cli/vendor/github.com/imdario/mergo.deepMerge(0x176ae40, 0xc42053f780, 0x99, 0x176ae40, 0xc42053f700, 0x99, 0xc4204b6c30, 0x1, 0xc4205d7e80, 0x0, ...)
        /go/src/github.com/docker/cli/vendor/github.com/imdario/mergo/merge.go:68 +0x1465
github.com/docker/cli/vendor/github.com/imdario/mergo.deepMerge(0x160f1e0, 0xc4203b1070, 0x195, 0x160f1e0, 0xc4203b1078, 0x195, 0xc4204b6c30, 0x0, 0xc4205d7e80, 0x195, ...)
        /go/src/github.com/docker/cli/vendor/github.com/imdario/mergo/merge.go:104 +0x69c
github.com/docker/cli/vendor/github.com/imdario/mergo._map(0x1548fa0, 0xc4203b1070, 0x1548fa0, 0xc4203b1078, 0x0, 0x0, 0x0, 0x1, 0xc4203b1078)
        /go/src/github.com/docker/cli/vendor/github.com/imdario/mergo/map.go:159 +0x3d4
github.com/docker/cli/vendor/github.com/imdario/mergo.Map(0x1548fa0, 0xc4203b1070, 0x1548fa0, 0xc4203b1078, 0x0, 0x0, 0x0, 0x0, 0x0)
        /go/src/github.com/docker/cli/vendor/github.com/imdario/mergo/map.go:132 +0x71
github.com/docker/cli/cli/compose/loader.mergeNetworks(0xc42063cc60, 0xc420808db0, 0xc420255ec0, 0x0, 0x0)
        /go/src/github.com/docker/cli/cli/compose/loader/merge.go:221 +0xb7
github.com/docker/cli/cli/compose/loader.merge(0xc42056e100, 0x6, 0x8, 0xc4200769c0, 0x42, 0xc420104180)
        /go/src/github.com/docker/cli/cli/compose/loader/merge.go:35 +0x1b5
github.com/docker/cli/cli/compose/loader.Load(0x17ff5a5, 0x3, 0xc4200769c0, 0x42, 0xc420104180, 0x6, 0x8, 0xc42055a5d0, 0x42, 0xc420104180, ...)
        /go/src/github.com/docker/cli/cli/compose/loader/loader.go:84 +0x5ae
github.com/docker/cli/cli/command/stack/loader.LoadComposefile(0x24f44e0, 0xc420112b00, 0x0, 0x0, 0xc4202e3280, 0x6, 0x8, 0x7ffd3664e707, 0xb, 0x1802591, ...)
        /go/src/github.com/docker/cli/cli/command/stack/loader/loader.go:28 +0x176
github.com/docker/cli/cli/command/stack/swarm.deployCompose(0x24ecde0, 0xc420014088, 0x24f44e0, 0xc420112b00, 0x0, 0x0, 0xc4202e3280, 0x6, 0x8, 0x7ffd3664e707, ...)
        /go/src/github.com/docker/cli/cli/command/stack/swarm/deploy_composefile.go:21 +0x70
github.com/docker/cli/cli/command/stack/swarm.RunDeploy(0x24f44e0, 0xc420112b00, 0x0, 0x0, 0xc4202e3280, 0x6, 0x8, 0x7ffd3664e707, 0xb, 0x1802591, ...)
        /go/src/github.com/docker/cli/cli/command/stack/swarm/deploy.go:39 +0x199
github.com/docker/cli/cli/command/stack.newDeployCommand.func1(0xc4204ef680, 0xc4204f4270, 0x1, 0xd, 0x0, 0x0)
        /go/src/github.com/docker/cli/cli/command/stack/deploy.go:29 +0x1f5
github.com/docker/cli/vendor/github.com/spf13/cobra.(*Command).execute(0xc4204ef680, 0xc420010130, 0xd, 0xd, 0xc4204ef680, 0xc420010130)
        /go/src/github.com/docker/cli/vendor/github.com/spf13/cobra/command.go:700 +0x47a
github.com/docker/cli/vendor/github.com/spf13/cobra.(*Command).ExecuteC(0xc420515200, 0xc420112b00, 0xc4205393b0, 0xc4203b0330)
        /go/src/github.com/docker/cli/vendor/github.com/spf13/cobra/command.go:785 +0x30e
github.com/docker/cli/vendor/github.com/spf13/cobra.(*Command).Execute(0xc420515200, 0xc420515200, 0x24cdf20)
        /go/src/github.com/docker/cli/vendor/github.com/spf13/cobra/command.go:738 +0x2b
main.main()
        /go/src/github.com/docker/cli/cmd/docker/docker.go:161 +0xc3
```

**Describe the results you expected:**
Stack started

**Additional information you deem important (e.g. issue happens only occasionally):**

**Output of `docker version`:**

```
Client:
 Version:       18.03.0-ce
 API version:   1.37
 Go version:    go1.9.4
 Git commit:    0520e24
 Built: Wed Mar 21 23:09:15 2018
 OS/Arch:       linux/amd64
 Experimental:  false
 Orchestrator:  swarm

Server:
 Engine:
  Version:      18.03.0-ce
  API version:  1.37 (minimum version 1.12)
  Go version:   go1.9.4
  Git commit:   0520e24
  Built:        Wed Mar 21 23:13:03 2018
  OS/Arch:      linux/amd64
  Experimental: false

```

**Output of `docker info`:**

```
Containers: 1
 Running: 1
 Paused: 0
 Stopped: 0
Images: 207
Server Version: 18.03.0-ce
Storage Driver: overlay2
 Backing Filesystem: xfs
 Supports d_type: true
 Native Overlay Diff: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
 Volume: local
 Network: bridge host macvlan null overlay
 Log: awslogs fluentd gcplogs gelf journald json-file logentries splunk syslog
Swarm: active
 NodeID: 0s78535tdeb7t7rhyr1qc3vt8
 Is Manager: true
 ClusterID: tw9nrjpq2635f7ec5pyod40z6
 Managers: 1
 Nodes: 3
 Orchestration:
  Task History Retention Limit: 5
 Raft:
  Snapshot Interval: 10000
  Number of Old Snapshots to Retain: 0
  Heartbeat Tick: 1
  Election Tick: 3
 Dispatcher:
  Heartbeat Period: 5 seconds
 CA Configuration:
  Expiry Duration: 3 months
  Force Rotate: 0
 Autolock Managers: false
 Root Rotation In Progress: false
 Node Address: 172.31.0.157
 Manager Addresses:
  172.31.0.157:2377
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: cfd04396dc68220d1cecbe686a6cc3aa5ce3667c
runc version: 4fc53a81fb7c994640722ac585fa9ca548971871
init version: 949e6fa
Security Options:
 seccomp
  Profile: default
Kernel Version: 4.15.11-1.el7.elrepo.x86_64
Operating System: CentOS Linux 7 (Core)
OSType: linux
Architecture: x86_64
CPUs: 4
Total Memory: 7.297GiB
Name: awssparkmaster01
ID: YMD2:OWOB:BU3J:EEIZ:ODNQ:N7FY:POJ2:SS6H:G2ZT:5KLB:7CFL:MWZX
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
Labels:
Experimental: false
Insecure Registries:
 master:5000
 127.0.0.0/8
Live Restore Enabled: false

WARNING: bridge-nf-call-ip6tables is disabled
```

**Additional environment details (AWS, VirtualBox, physical, etc.):**
Running in AWS on CentOS


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reflect.Value.Set using unaddressable value #972

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reflect.Value.Set using unaddressable value #972

Description

BUG REPORT INFORMATION

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Metadata

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