[Provision] Don't provision glance images if Glance wasn't installed
[Provision] Don't provision glance images if Glance wasn't installed

Change-Id: I307a1c273d3a410edd69eade880b93ccddb17ae6
Resolves: rhbz#1175726

imcsk8/packstack,palmer159/openstack-test,mahak/packstack,xbezdick/packstack,stackforge/packstack,palmer159/openstack-test,openstack/packstack,fr34k8/packstack,openstack/packstack,xbezdick/packstack,stackforge/packstack,stackforge/packstack,fr34k8/packstack,mahak/packstack,imcsk8/packstack,fr34k8/packstack,palmer159/openstack-test,xbezdick/packstack,openstack/packstack,mahak/packstack,imcsk8/packstack