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/configuration.rst b/doc/source/configuration.rst
index 550d2ce..8ec0013 100644
--- a/doc/source/configuration.rst
+++ b/doc/source/configuration.rst
@@ -5,7 +5,7 @@
 
 Patrole can be customized by updating Tempest's ``tempest.conf`` configuration
 file. All Patrole-specific configuration options should be included under
-the ``rbac`` group.
+the ``patrole`` group.
 
 RBAC Test Role
 --------------