skip stamp test until race in nova can be debugged

This test is causing a lot of gate resets, and as far as I can
tell they are really nova races in volume attachments. However
we should skip the test for now until these can be sorted out.

Related to bug #1205344

Change-Id: I983779841ac3d3f79442e96b37a0cc8da85ae55b
diff --git a/tempest/scenario/test_stamp_pattern.py b/tempest/scenario/test_stamp_pattern.py
index 89beb15..a6f2206 100644
--- a/tempest/scenario/test_stamp_pattern.py
+++ b/tempest/scenario/test_stamp_pattern.py
@@ -15,12 +15,15 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import time
+
 from cinderclient import exceptions
+import testtools
+
 from tempest.common import log as logging
 from tempest.common.utils.data_utils import rand_name
 from tempest.common.utils.linux.remote_client import RemoteClient
 from tempest.scenario import manager
-import time
 
 LOG = logging.getLogger(__name__)
 
@@ -197,6 +200,7 @@
         got_timestamp = ssh_client.exec_command('sudo cat /mnt/timestamp')
         self.assertEqual(self.timestamp, got_timestamp)
 
+    @testtools.skip("Until Bug #1205344 is fixed")
     def test_stamp_pattern(self):
         # prepare for booting a instance
         self._add_keypair()