docs(openstack): instructions did not work.

The openstack instructions were a mix of new/old commands and
wouldn't work on a lot of openstack installs.

These documentation and changes to the provisioning script should
allow for more variation in openstack installs.

This has been tested as working against both a Havana and Juno release
of Openstack.
This is already outdated, so we should probably just link over to http://docs.deis.io/en/latest/using_deis/install-client/ and http://docs.deis.io/en/latest/installing_deis/install-deisctl/