Add glance-simplestreams-sync set_latest_property config functest

When creating Openstack VMs the user has to specify the image it wants
to use. sstream-mirror-glance adds a date to the image name, so they
always have to recheck which is the current latest image.

This commit tests the usage of the `set_latest_property` configuration.

When --set-latest-property is given sstream-mirror-glance will set the
recently synced image with the `latest=true` property and then remove
the `latest` property from all the os_version/architecture matching
images.

Closes-bug: LP #1933130

zaza/openstack/charm_tests/glance_simplestreams_sync/tests.py

@@ -125,3 +125,25 @@ def _check_local_product_streams(expected_images):
         _check_local_product_streams(expected_images)
 
         logging.debug("Local product stream successful")
+
+
+class GlanceSimpleStreamsSyncWithPropertiesTest(GlanceSimpleStreamsSyncTest):
+
+    @classmethod
+    def setUpClass(cls):
+        """Run class setup for running glance simple streams sync tests."""
+        super(GlanceSimpleStreamsSyncWithPropertiesTest, cls).setUpClass()
+        zaza_model.set_application_config('glance-simplestreams-sync',
+                                          {'set_latest_property': 'true'})
+        zaza_model.wait_for_application_states()
+
+    # TODO(guimalufb) test if the latest property gets removed from old images
+    def test_200_check_image_latest_property(self):
+        """Verify that a property inclusion has been done"""
+        logging.debug("Checking image latest property")
+
+        filter_properties = {'filters': {'latest': 'true'}}
+        images = self.glance_client.images.list(**filter_properties)
+        self.assertTrue(len(list(images)) > 0,
+                        "'latest=true' property not found in glance images"
+                        " list")