An OSD on a PVC when portable=false is assigned to a node
with a node selector. The same node assignment is expected
for the lifetime of the cluster. On subsequent reconciles,
the operator was looking up the node assignment from the
nodeName on the pod spec, which is not set if the pod is down.
The operator needs to retrieve the assignment from the
deployment spec node selector.
Signed-off-by: Travis Nielsen <tnielsen@redhat.com>