Fix [H405] pep rule in heat_integrationtests

Implements bp docstring-improvements

Change-Id: I7aebbdafef121c3414e6a0260452c1353af62e88
diff --git a/functional/test_conditional_exposure.py b/functional/test_conditional_exposure.py
index d037712..90f7d7a 100644
--- a/functional/test_conditional_exposure.py
+++ b/functional/test_conditional_exposure.py
@@ -82,7 +82,7 @@
 """
 
     def test_non_admin_forbidden_create_flavors(self):
-        """Fail to create Flavor resource w/o admin role
+        """Fail to create Flavor resource w/o admin role.
 
         Integration tests job runs as normal OpenStack user,
         and OS::Nova:Flavor is configured to require