enforcing single proposal for nova
Merge remote-tracking branch 'crowbar/release/pebbles/master' into release/pebbles/master
Merge pull request #159 from arkadykanevsky/pull-req-release-pebbles-master-79c57cd7d40ba8de015310df1f8f9e8b30a9b020

enforcing single proposal for all openstack barclamps [3/9]