Label support to kubernetes action plugin

[yangcao77]

This is a change require for RHTAP 1.0. more details can be found in: https://docs.google.com/document/d/1XWXpUdznOhR6J23UO0i9euZS21hn2iUSB2fv6gX2pjo/edit?usp=sharing

What do you want to improve?

Label support to kubernetes action plugin

What is the current behavior?

Currently the create-namespace action create a namespace

What will the new behavior be?

It should have an optional input to allow setting labels to the new namespace.

[kadel]

fixed in #1223