networking-sfc: skip releasenotes job before Ocata
networking-sfc: skip releasenotes job before Ocata

Release notes were added after the Newton branching

Change-Id: I38af88f4bdc9bbf005deb0147614d5b72ab2d298

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