spec file for pulp_openstack

This builds the following:

pulp-openstack-admin-extensions
pulp-openstack-plugins
python-pulp-openstack-common

You will need to pull down python-keystoneclient and python-glanceclient. Both
are available from RDO.

This patch requires a `tito init` after merging. The %changelog will then be populated.
should this have at least an initial entry? I think Fedora requires that for new packages.