The `mgr host ls` looks like:
`"addr": "10.1.0.27/fv-az244-362", "hostname": "fv-az244-362"`
Previously, we were picking `addr` which contains both IP and hostname
where the k8snode has the hostname only. So let's use the Hostname from
the mgr command output instead.
Signed-off-by: Sébastien Han <seb@redhat.com>