Replace `OPENSTACK` occurrences by `RACKSPACE`. Minor PEP-8.
Merge pull request #407 from s0undt3ch/develop

Replace `OPENSTACK` occurrences by `RACKSPACE`. Minor PEP-8.
Allow specifying the deploy value from the `vm` profile.

Now, the `vm` deploy value is grabbed initially from the `vm` profile, and if not set, grab the value from `__opts__`.