Do not run release notes for openstack-manuals/liberty
Do not run release notes for openstack-manuals/liberty

The stable/liberty branch does not have release notes, do not run it
there.

Also, sort and shorten the python client regex for releasenotes.

Change-Id: Ibad90ab096fed721b6a853439907c5db57692c3e

Tesora/tesora-project-config,Tesora/tesora-project-config,dongwenjuan/project-config,openstack-infra/project-config,openstack-infra/project-config,dongwenjuan/project-config