RESTMapper should take into account multiple versions

When a CLI command `kubectl get rc --api-version=v1beta3` is called,
the API resource name should match v1beta3, not whatever the default
RESTMapper version is.  This allows the correct resource name to be
returned ("replicationcontrollers", instead of "replicationControllers").
Use preferred resource version
Allow the api-version on the command to override the client builder
Merge pull request #2909 from smarterclayton/passversiontorestmapper

Allow --api-version to properly override various default behaviors in CLI