skip flaky buildman test

test/test_buildman.py

@@ -159,6 +159,7 @@ class TestEphemeral(unittest.TestCase):
     self.etcd_client_mock.delete.assert_called_once_with(self.mock_job_key)
 
   @async_test
+  @unittest.skip('this test is flaky on Quay.io builders')
   def test_another_manager_takes_job(self):
     # Prepare a job to be taken by another manager
     test_component = yield From(self._setup_job_for_managers())