Flocker deploy 121

I would like this to be looked over by someone, for guidance on what needs to be done, and confirmation I'm on the right track.

And, now, the comment on #121 that some of this might not be necessary for now.

There are a couple of inline "TODO"s I'm not sure about.

Fixes #121 
@exarkun I'm guessing that means that flocker-volume is not going away.

If that is correct, do you think I should move flocker-volume's CLI to flocker.cli?