Merge "Split up metering test case into plugin + test case"

diff --cc neutron/tests/unit/db/metering/test_db_metering.py
index fba83339afeb679ce86ef2a1f2a23812d53e647d,fc61cbb2d23bcff3e51616beb8311da32ded547d..06ec8b1464a1646ce1315aa3e34cfb551285b5d9
--- 1/neutron/tests/unit/db/metering/test_db_metering.py
--- 2/neutron/tests/unit/db/metering/test_db_metering.py
+++ b/neutron/tests/unit/db/metering/test_db_metering.py
@@@ -140,8 -141,10 +140,10 @@@ class MeteringPluginDbTestCase(test_db_
              {constants.METERING: self.plugin}
          )
          app = config.load_paste_app('extensions_test_app')
 -        self.ext_api = ExtensionMiddleware(app, ext_mgr=ext_mgr)
 +        self.ext_api = extensions.ExtensionMiddleware(app, ext_mgr=ext_mgr)
  
+ 
+ class TestMetering(MeteringPluginDbTestCase):
      def test_create_metering_label(self):
          name = 'my label'
          description = 'my metering label'