Fixed the instance status returned during instance deletion.
Fixed the instance status returned during instance deletion.

citrix-openstack/build-trove,mmasaki/trove,changsimon/trove,fabian4/trove,zhangg/trove,cp16net/trove,denismakogon/trove-guestagent,citrix-openstack/build-trove,hplustree/trove,redhat-openstack/trove,fabian4/trove,openstack/trove,citrix-openstack-build/trove,zhangg/trove,zhujzhuo/openstack-trove,mmasaki/trove,citrix-openstack-build/trove,changsimon/trove,redhat-openstack/trove,zhujzhuo/openstack-trove,openstack/trove,fabian4/trove,mmasaki/trove,denismakogon/trove-guestagent,changsimon/trove,cp16net/trove,cp16net/trove,citrix-openstack-build/trove,zhujzhuo/openstack-trove,redhat-openstack/trove,citrix-openstack/build-trove,hplustree/trove