Deprecate [rbac] configuration group.

The [rbac] configuration group has been deprecated
and will be removed in the next release. It has been
renamed to the [patrole] group which contains
the exact same options.

This commit makes necessary deprecation changes,
along with renaming changes to documentation, unit
tests and framework.

Change-Id: I71198506b97b98ac18a969b7e6b13b664579c081
diff --git a/doc/source/sampleconf.rst b/doc/source/sampleconf.rst
index 43933db..94ebc4d 100644
--- a/doc/source/sampleconf.rst
+++ b/doc/source/sampleconf.rst
@@ -7,7 +7,7 @@
 
 .. code-block:: ini
 
-    [rbac]
+    [patrole]
 
     # The role that you want the RBAC tests to use for RBAC testing
     # This needs to be edited to run the test as a different role.