ovn: Don't install Neutron from PyPI but use RPMs instead
ovn: Don't install Neutron from PyPI but use RPMs instead

The patch removes installation from PyPI because it always uses the
latest released version - so for OSP16 it's Ussuri. We should be testing
integration with packages we distribute.

Change-Id: Ie6f7de33d1da291c651e3e78405643fc31c7efbf

redhat-openstack/octario,redhat-openstack/octario