Set Ubuntu Xenial to non-voting
Set Ubuntu Xenial to non-voting

The packages with Xenial are currently causing a bug when Tempest
is running with a timeout in assigning a floating IP.  It seems
like a packaging issue for now so disabling to get the gate moving.

Change-Id: Idb324f7164a291ba647badd156e4792e72a6ddec

openstack/puppet-openstack-integration,openstack/puppet-openstack-integration,openstack/puppet-openstack-integration