Fix [H405] pep rule in heat_integrationtests

Implements bp docstring-improvements

Change-Id: I7aebbdafef121c3414e6a0260452c1353af62e88
diff --git a/common/clients.py b/common/clients.py
index daba708..9718d03 100644
--- a/common/clients.py
+++ b/common/clients.py
@@ -23,7 +23,8 @@
 
 
 class ClientManager(object):
-    """
+    """Provides access to the official python clients for calling various APIs.
+
     Manager that provides access to the official python clients for
     calling various OpenStack APIs.
     """