vitrage-base: honor distro_python_version
vitrage-base: honor distro_python_version

Change-Id: I27c71c1237dc010531495440e6094d8b129f6c48

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