Ignore changes in docs when running tempest tests
Ignore changes in docs when running tempest tests

The change adds `irrelevant-files` to monasca-tempest-base configuration
with the goal to skip running the job for changes in documentation.

Change-Id: Iaaba10b26f00bd816f7fc15dd45bddb87ef6f844

openstack/monasca-log-api,stackforge/monasca-log-api,stackforge/monasca-log-api,stackforge/monasca-log-api,openstack/monasca-log-api,openstack/monasca-log-api