Avoid snapshotting from compute authorization test

The compute authorization API tests currently rely on the creation of an image
via an instance snapshot.  Not all compute drivers support this and the tests
do not actually require the image to be a snapshot.  Instead, create a dummy
image in Glance directly to avoid making auth tests dependent on a hypervisor
feature.

Change-Id: I83a0fe12b1077ea87e402ec9897931631fa9cbf6
Closes-bug: #1331138
diff --git a/tempest/api/compute/test_authorization.py b/tempest/api/compute/test_authorization.py
index 375ddf8..fb8ded3 100644
--- a/tempest/api/compute/test_authorization.py
+++ b/tempest/api/compute/test_authorization.py
@@ -13,6 +13,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import StringIO
+
 from tempest.api.compute import base
 from tempest import clients
 from tempest.common.utils import data_utils
@@ -27,9 +29,10 @@
 
 
 class AuthorizationTestJSON(base.BaseV2ComputeTest):
-
     @classmethod
     def setUpClass(cls):
+        if not CONF.service_available.glance:
+            raise cls.skipException('Glance is not available.')
         # No network resources required for this test
         cls.set_network_resources()
         super(AuthorizationTestJSON, cls).setUpClass()
@@ -38,6 +41,7 @@
             raise cls.skipException(msg)
         cls.client = cls.os.servers_client
         cls.images_client = cls.os.images_client
+        cls.glance_client = cls.os.image_client
         cls.keypairs_client = cls.os.keypairs_client
         cls.security_client = cls.os.security_groups_client
 
@@ -57,9 +61,14 @@
         resp, cls.server = cls.client.get_server(server['id'])
 
         name = data_utils.rand_name('image')
-        resp, body = cls.images_client.create_image(server['id'], name)
-        image_id = data_utils.parse_image_id(resp['location'])
-        cls.images_client.wait_for_image_status(image_id, 'ACTIVE')
+        resp, body = cls.glance_client.create_image(name=name,
+                                                   container_format='bare',
+                                                   disk_format='raw',
+                                                   is_public=False)
+        image_id = body['id']
+        image_file = StringIO.StringIO(('*' * 1024))
+        resp, body = cls.glance_client.update_image(image_id, data=image_file)
+        cls.glance_client.wait_for_image_status(image_id, 'active')
         resp, cls.image = cls.images_client.get_image(image_id)
 
         cls.keypairname = data_utils.rand_name('keypair')