ppc64le: Update trigger times for disk image job
ppc64le: Update trigger times for disk image job

To avoid hitting 'no node available' errors, we are shifting when
disk image jobs start. This patch moves them 3 hours after
container image jobs start, which should give both jobs enough
exclusive time to complete

Change-Id: I42f2c3653d9b24e9648550a053a71db7c8e1e251

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