[tripleo] default ceph migrating from luminous to nautilus

We're going to be making some updates in TripleO and RDO so that the default version of Ceph in Stein is Nautilus. Part of this involves temporarily disabling the standalone 001/004 jobs. Our reviews are lined up and linked with additional details on the TripleO Integration Squad etherpad [1]. We'll be waiting until the 3rd party checks are green [2] before we start merging. John [1] https://etherpad.openstack.org/p/tripleo-integration-squad-status [2] https://etherpad.openstack.org/p/ruckroversprint9