Add method for setting up cirros image.

add_cirros_image is designed to be called by the configure step
of charms to setup a cirros image in the deployment.

zaza/charm_tests/glance/setup.py

@@ -1,5 +1,24 @@
 """Code for configuring glance."""
 
+import zaza.utilities.openstack as openstack_utils
+
+
+def add_cirros_image(glance_client=None):
+    """Add a cirros image to the current deployment.
+
+    :param glance: Authenticated glanceclient
+    :type glance: glanceclient.Client
+    """
+    if not glance_client:
+        keystone_session = openstack_utils.get_overcloud_keystone_session()
+        glance_client = openstack_utils.get_glance_session_client(
+            keystone_session)
+    image_url = openstack_utils.find_cirros_image(arch='x86_64')
+    openstack_utils.create_image(
+        glance_client,
+        image_url,
+        'cirrosimage')
+
 
 def basic_setup():
     """Run setup for testing glance.
@@ -7,4 +26,4 @@ def basic_setup():
     Glance setup for testing glance is currently part of glance functional
     tests. Image setup for other tests to use should go here.
     """
-    pass
+    add_cirros_image()