[HEAT] Fixed rollback error on failure during scale down
[HEAT] Fixed rollback error on failure during scale down

Change-Id: I23ac97f93e91e1beb480ecdd201be3342b04d718
Closes-Bug: #1364426

keedio/sahara,matips/iosr-2015,henaras/sahara,mapr/sahara,zhujzhuo/Sahara,zhangjunli177/sahara,tellesnobrega/sahara,crobby/sahara,crobby/sahara,esikachev/scenario,henaras/sahara,zhangjunli177/sahara,openstack/sahara,zhangjunli177/sahara,henaras/sahara,esikachev/sahara-backup,xme1226/sahara,bigfootproject/sahara,openstack/sahara,xme1226/sahara,ekasitk/sahara,zhujzhuo/Sahara,keedio/sahara,egafford/sahara,bigfootproject/sahara,esikachev/scenario,xme1226/sahara,citrix-openstack-build/sahara,esikachev/sahara-backup,esikachev/sahara-backup,redhat-openstack/sahara,citrix-openstack-build/sahara,mapr/sahara,citrix-openstack-build/sahara,mapr/sahara,bigfootproject/sahara,keedio/sahara,matips/iosr-2015,crobby/sahara,matips/iosr-2015,tellesnobrega/sahara,ekasitk/sahara,egafford/sahara,redhat-openstack/sahara,zhujzhuo/Sahara,ekasitk/sahara,redhat-openstack/sahara,esikachev/scenario