Reenable security group related test case

* 'A DELETE request for another user's security group should fail'

Change-Id: I0955d696d68f503554217617069f59f1e87c670f
diff --git a/tempest/tests/compute/test_authorization.py b/tempest/tests/compute/test_authorization.py
index 0d08c18..9b6be80 100644
--- a/tempest/tests/compute/test_authorization.py
+++ b/tempest/tests/compute/test_authorization.py
@@ -324,7 +324,6 @@
                           "happen if the tenant id does not match the"
                           " current user")
 
-    @unittest.skip("Skipped until the Bug #1001118 is resolved")
     @raises(exceptions.NotFound)
     @attr(type='negative')
     def test_delete_security_group_rule_of_alt_account_fails(self):