unskipping bug related to test_stamp_pattern.py

The bug (1205344) is medium importance in nova.
So the skip probably not required.

Change-Id: I2a8da038d09b7962c2760a9fc9f9046355ab4d23
diff --git a/tempest/scenario/test_stamp_pattern.py b/tempest/scenario/test_stamp_pattern.py
index ab464e3..6766239 100644
--- a/tempest/scenario/test_stamp_pattern.py
+++ b/tempest/scenario/test_stamp_pattern.py
@@ -18,7 +18,6 @@
 import time
 
 from cinderclient import exceptions as cinder_exceptions
-import testtools
 
 from tempest.common.utils.data_utils import rand_name
 from tempest import exceptions
@@ -143,7 +142,6 @@
         got_timestamp = ssh_client.exec_command('sudo cat /mnt/timestamp')
         self.assertEqual(self.timestamp, got_timestamp)
 
-    @testtools.skip("Skipped until the Bug #1205344 is resolved.")
     @tempest.test.services('compute', 'network', 'volume', 'image')
     def test_stamp_pattern(self):
         # prepare for booting a instance