GS-11168 Cleanup Cloud after all machines undeployed

git-svn-id: svn://pc-lab14/SVN/xap/trunk/openspaces@145900 eb64e737-3616-4df0-8941-5ee2ae88103d
CLOUDIFY-1811 Make cleanup cloud run only once, even if there was an exception

git-svn-id: svn://pc-lab14/SVN/xap/trunk/openspaces@145901 eb64e737-3616-4df0-8941-5ee2ae88103d