Fix kolla docs skip
Fix kolla docs skip

With the rename of the docs jobs to
end with docs-ubuntu-trusty/docs-ubuntu-xenial, the regex that skipped
all jobs except docs suddenly skipped also the docs job.

Adjust regex for job rename so that job is run for doc only changes.

Change-Id: I5c5cf6fc07826d14add051b6839a14b6d8429855

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