Add compute hosts support.

Change-Id: I51c443512a82729564b76e6f835195ff193232d2
Add volume support for openstack client

fix with dtroyer's comments
rebase
fix with dhellmann's comments
create/list/delete/show/set for volume commands

Change-Id: Id8236685d815dbf73873bab2363d82274a9aa556
add domain, credential to identity v3 api

moved policy.py to it's own patch
minor changes based on comments
reworked it now that the domain specs have changed
added credential - create, delete, update, show, list
added domain - create, delete, update, show, list
update setup.py entry points

Change-Id: I6bbbb8fdfbc3e76ba75374e9579eb92c96c928fe
Merge "Add volume support for openstack client"
Merge "Add compute hosts support."
Merge "add domain, credential to identity v3 api"