Separate api and registry packages for Red Hat

Starting in Kilo, Red Hat-based platforms are using separate
glance-api and glance-registry packages (for an example, see
http://trunk.rdoproject.org/f21/current/).

Change-Id: I3ad476846d7dec3ca612e5b0d20b21b8577f4af0

spec/classes/glance_spec.rb

@@ -49,9 +49,7 @@ describe 'glance' do
     end
     let(:params) { default_params }
 
-    it { is_expected.to contain_package('openstack-glance').with(
-        :tag => ['openstack'],
-    )}
+    it { is_expected.to_not contain_package('openstack-glance') }
   end
 
 end