Switch bifrost jobs to nonvoting
Switch bifrost jobs to nonvoting

bifrost doesn't have a symmetrical gate with ironic, which means
sometimes it can get broken by ironic changes. It's important that we
don't break bifrost, but sometimes it can break us, so let's change it
to non-voting and pay attention to it.

Change-Id: I69a6c4b05cfeebb31721c9787241161a080da045

openstack-infra/shade,openstack-infra/shade