Clean up README.rst in docker repo
Clean up README.rst in docker repo

Specify more clearly the repo split

Change-Id: Id9105bcab921deee86962c055c37b5156fcc2190

intel-onp/kolla,openstack/kolla,mrangana/kolla,stackforge/kolla,coolsvap/kolla,GalenMa/kolla,openstack/kolla,nihilifer/kolla,stackforge/kolla,nihilifer/kolla,GalenMa/kolla,coolsvap/kolla,rahulunair/kolla,stackforge/kolla,intel-onp/kolla,coolsvap/kolla,mrangana/kolla,rahulunair/kolla