Enable more extensions in pep8
Enable more extensions in pep8

This patch enable extensions:
-[H204] Use assert(Not)Equal to check for equality.
-[H205] Use assert(Greater|Less)(Equal) for comparison.

Change-Id: I31084170cd4cd4f4626aac459d9a61a4c5c67153

stackforge/senlin,openstack/senlin,stackforge/senlin,openstack/senlin,openstack/senlin