Switching the cobaltclient to use live-image nomenclature

Adding new commands based around the live-image noemenclauter and
marking the existing commands (e.g. bless, launch, etc.) deprecated.
The old commands will still work until we can move everything over
to the new live-image commands.

Change-Id: I58798ee6f72125b3330c8e5c8190c4649129f24f