Clean up Glance image after sanity check

The sanity check creates an image that needs to be
deleted after in order for the sanity check to
pass so that we complete deployment with a clean
enviroment.
Closes-bug: #1606580

Change-Id: Ib347f69b69229e39925f0c1ff11069b15afcf192

docker/kolla-toolbox/kolla_sanity.py

@@ -37,6 +37,8 @@ class SanityChecks(object):
         open("/tmp/blank.qcow2", 'a').close()
         cloud.create_image("test", filename="/tmp/blank.qcow2",
                            disk_format="qcow2", container_format="bare")
+        testid = cloud.get_image_id("test")
+        cloud.delete_image(testid)
 
     @staticmethod
     def cinder(cloud):