If you specify --kind and --docker, --docker is silently ignored

[sdague]

When you set an action using the wsk action update command, and specify both --kind and --docker, the --docker portion is silently ignored. Instead at least a warning should be provided to the users to ensure that they get something consistent.

This tripped me up when moving from a --kind python:3 to --docker as I didn't remember to delete the --kind from my script, then my image wasn't used, the base python3action was used instead.

[csantanapr]

@jessealva take a look when you have a chance.

[csantanapr]

Issue moved to apache/incubator-openwhisk-cli #122 via ZenHub