scenario002: disable swift backend for Glance on Ubuntu
scenario002: disable swift backend for Glance on Ubuntu

UCA contains a wrong version on glance-store that is not working when
running Swift backend.

Until they update the package to 0.13.0, we can't test Swift backend
anymore on Trusty.

Change-Id: I43f64f757cc28232f367a4a454b6e499f31c5fe8

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