Revert "Skip aodhclient plugin test"

This reverts commit 575827c.

Reason for revert:
The issue with pyparsing bump was already resolved.

Change-Id: Ia01ad211eab1b8ae558a85b9e51df46164d7a1d1
(cherry picked from commit eea7ea0)
(cherry picked from commit 6cde44d)
(cherry picked from commit 933f921)

heat/tests/clients/test_aodh_client.py

@@ -10,15 +10,13 @@
 #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 #    License for the specific language governing permissions and limitations
 #    under the License.
-from testtools import testcase
 
 from heat.tests import common
 from heat.tests import utils
 
 
 class AodhClientPluginTest(common.HeatTestCase):
 
-    @testcase.skip('skipped till python-aodhclient fixed for pyparsing 3.0.6')
     def test_create(self):
         context = utils.dummy_context()
         plugin = context.clients.client_plugin('aodh')