Cleanup ConfFixture

This makes the ConfFixture extend the Config fixture from
oslo.config which handles cleanup for us. The module level
import_opt calls are also removed since they are no longer
needed.

Change-Id: I869e89c53284c8da45e0b1293f2d35011f5bfbf9

watcher/tests/conf_fixture.py

@@ -14,30 +14,21 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import fixtures
 from oslo_config import cfg
+from oslo_config import fixture as conf_fixture
 
 from watcher.common import config
 
-CONF = cfg.CONF
-CONF.import_opt('host', 'watcher.conf.service')
-CONF.import_opt('connection', 'oslo_db.options', group='database')
-CONF.import_opt('sqlite_synchronous', 'oslo_db.options', group='database')
 
-
-class ConfFixture(fixtures.Fixture):
+class ConfFixture(conf_fixture.Config):
     """Fixture to manage conf settings."""
 
-    def __init__(self, conf=cfg.CONF):
-        self.conf = conf
-
     def setUp(self):
         super(ConfFixture, self).setUp()
 
         self.conf.set_default('connection', "sqlite://", group='database')
         self.conf.set_default('sqlite_synchronous', False, group='database')
         config.parse_args([], default_config_files=[])
-        self.addCleanup(self.conf.reset)
 
 
 class ConfReloadFixture(ConfFixture):