Run heat_integrationtests as a tempest plugin

completes blueprint tempest-plugin-support

Change-Id: I0109e68bb135cd257e2fff74e75575a7e2f91539
diff --git a/common/test.py b/common/test.py
index 2bf7771..ce825c7 100644
--- a/common/test.py
+++ b/common/test.py
@@ -73,7 +73,7 @@
     def setUp(self):
         super(HeatIntegrationTest, self).setUp()
 
-        self.conf = config.init_conf().heat_plugin
+        self.conf = config.CONF.heat_plugin
 
         self.assertIsNotNone(self.conf.auth_url,
                              'No auth_url configured')