This is the client side implementation of exposed container's
ports. In particular, it adds an option '-p' or '--expose-port'
to the container create/run command. For example:
zun run -p 80/tcp nginx
Depends-On: Id713ce602dca8e74089d4a5eea8df41ea8784db4
Change-Id: Iafb1f446e203bdcb5f103d4a73f4124db57868e4
Partial-Implements: blueprint support-port-bindings