Repair broken nailgun test in master

merge 15e6a73 (today) caused by ed96aec9

Caused ERROR: test_stop_provisioning
 (nailgun.test.integration.test_stop_deployment.TestStopDeployment)

Due to differing changes between
 https://review.openstack.org/#/c/79562/
 https://review.openstack.org/#/c/81501/

Change-Id: I6c4b4d9d0383992e871b721e9d39f650fe17495a