horizon: Update job skip condition for doc-only changes
horizon: Update job skip condition for doc-only changes

* After -ubuntu-xenial prefix was added, several jobs
  are run unexpectedly for docs only changes.
  Apply (-ubuntu-.*)? and (-nv)? to all jobs.
* Skip gate-horizon-dsvm-tempest-plugin-.* jobs

Change-Id: I1a8a7e45fa32a8f450479383815b785bd3fb9e7c

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