Skip plugins install for keystone binary builds
Skip plugins install for keystone binary builds

There should be no pip install in binary builds, move the installation
of the downloaded bits where it belongs into the 'source' install_type
section.

Change-Id: I6d8609d072d18e635250df1c1e9aa687ce1f769d

rahulunair/kolla,openstack/kolla,openstack/kolla,rahulunair/kolla,stackforge/kolla,stackforge/kolla,stackforge/kolla