Suggest `oc get dc` in output of `oc deploy`
Suggest `oc get dc` in output of `oc deploy`

This patch suggests `<root_cmd> get dc` as part of the output in `oc
deploy` in order to help a user find a list of available deployment
configs.

`$ oc deploy`
```
error: a deployment config name is required. Use "oc get dc" for a list
of available deployment configs.
See 'oc deploy -h' for help and examples.
```

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