Add mol-promote_images job to gate/periodic
Add mol-promote_images job to gate/periodic

Job had been added to check only, so gate/periodic
pipelines are missing this job.

Change-Id: Ie8c8556632f92527795fc36c1e9c583bfb5d0ef8

redhat-openstack/rdo-infra,redhat-openstack/rdo-infra,rdo-infra/ci-config,rdo-infra/ci-config,redhat-openstack/rdo-infra,rdo-infra/ci-config,redhat-openstack/rdo-infra,rdo-infra/ci-config