This PS implements the Deckhand API client library
which is based off the python-novaclient code base.
The client library includes managers for all the
Deckhand APIs.
The following features have been implemented:
* Framework for API client library
* Manager for each Deckhand API (buckets, revisions, etc.)
* API client library documentation
Tests will be added in a follow-up (once Deckhand functional
tests use Keystone).
Change-Id: I829a030738f42dc7ddec623d881a99ed97d04520