Add bash completion to openstack clients

Created by: git-harry

Imported comments:

By sigmavirus24 on 2015-10-08 15:45:13 UTC

Why isn't this filed against OSA? This is a valid bug there too.

By git-harry on 2015-10-08 15:46:40 UTC

@sigmavirus24 https://bugs.launchpad.net/openstack-ansible/+bug/1465723

By prometheanfire on 2015-10-13 16:00:38 UTC

fixed in #483

By d34dh0r53 on 2015-10-14 14:55:49 UTC

Both have merged