overcloud update fails due to ceph dependency error in Red Hat OpenStack Platform

Issue

overcloud update fails due to ceph dependency error in Red Hat OpenStack Platform

During the upgrade phase of the overcloud, one may be running into a dependency issue. Although ceph is not used, the overcloud image by default contains ceph packages and yum is trying to upgrade these as part of its dependency list. Because ceph repositories are not enabled, these packages cannot be provided:

    "deploy_stderr": "Error: Package: 1:ceph-osd-0.94.5-14.el7cp.x86_64 (@rhos-9.0-director-ceph-1.3-osd-signed)\n           Requires: ceph = 1:0.94.5-14.el7cp\n           Removing: 1:ceph-0.94.5-14.el7cp.x86_64 (@rhos-9.0-director-ceph-1.3-mon-signed)\n               ceph = 1:0.94.5-14.el7cp\n           Updated By: 1:ceph-0.94.9-9.el7cp.x86_64 (rhel-7-server-rhceph-1.3-mon-rpms)\n               ceph = 1:0.94.9-9.el7cp\n           Available: 1:ceph-0.94.1-13.el7cp.x86_64 (rhel-7-server-rhceph-1.3-mon-rpms)\n               ceph = 1:0.94.1-13.el7cp\n           Available: 1:ceph-0.94.1-15.el7cp.x86_64 (rhel-7-server-rhceph-1.3-mon-rpms)\n               ceph = 1:0.94.1-15.el7cp\n           Available: 1:ceph-0.94.1-16.el7cp.x86_64 (rhel-7-server-rhceph-1.3-mon-rpms)\n               ceph = 1:0.94.1-16.el7cp\n           Available: 1:ceph-0.94.1-18.el7cp.x86_64 (rhel-7-server-rhceph-1.3-mon-rpms)\n               ceph = 1:0.94.1-18.el7cp\n           Available: 1:ceph-0.94.1-19.el7cp.x86_64 (rhel-7-server-rhceph-1.3-mon-rpms)\n               ceph = 1:0.94.1-19.el7cp\n           Available: 1:ceph-0.94.3-3.el7cp.x86_64 (rhel-7-server-rhceph-1.3-mon-rpms)\n               ceph = 1:0.94.3-3.el7cp\n           Available: 1:ceph-0.94.3-6.el7cp.x86_64 (rhel-7-server-rhceph-1.3-mon-rpms)\n               ceph = 1:0.94.3-6.el7cp\n           Available: 1:ceph-0.94.5-9.el7cp.x86_64 (rhel-7-server-rhceph-1.3-mon-rpms)\n               ceph = 1:0.94.5-9.el7cp\n           Available: 1:ceph-0.94.5-12.el7cp.x86_64 (rhel-7-server-rhceph-1.3-mon-rpms)\n               ceph = 1:0.94.5-12.el7cp\n           Available: 1:ceph-0.94.5-13.el7cp.x86_64 (rhel-7-server-rhceph-1.3-mon-rpms)\n               ceph = 1:0.94.5-13.el7cp\n           Available: 1:ceph-0.94.5-15.el7cp.x86_64 (rhel-7-server-rhceph-1.3-mon-rpms)\n               ceph = 1:0.94.5-15.el7cp\n           Available: 1:ceph-0.94.9-3.el7cp.x86_64 (rhel-7-server-rhceph-1.3-mon-rpms)\n               ceph = 1:0.94.9-3.el7cp\n           Available: 1:ceph-0.94.9-8.el7cp.x86_64 (rhel-7-server-rhceph-1.3-mon-rpms)\n               ceph = 1:0.94.9-8.el7cp\n", 
    "update_managed_packages": "false", 
    "deploy_status_code": 1