Ceph: [cephadm] "docker.io" is prepended to container image while upgrading from RHCS 5.x

Issue

Cephadm prepends "docker.io" to container image while upgrading from RHCS 5.x

Ceph upgrade fails with: "UPGRADE_FAILED_PULL: Upgrade: failed to pull target image" as docker.io is prepended to container image while performing an upgrade from RHCS 5.x in a disconnected environment.

[ceph: root@ceph1 /]# ceph orch upgrade status
{
    "target_image": "docker.io/cephadmin1:5000/rhceph-5-rhel8:latest",
    "in_progress": true,
    "services_complete": [],
    "progress": "",
    "message": "Error: UPGRADE_FAILED_PULL: Upgrade: failed to pull target image"

Cephadm prepends "docker.io" to the container image path.