Rename new releasenotes job
Rename new releasenotes job

This is a job to build, not to publish. Also, it's openstack specific,
so let's name it that way.

Change-Id: I4cdc38ede0b37b2d091911a240d44b324d4d227b

openstack-infra/openstack-zuul-jobs,openstack-infra/openstack-zuul-jobs