mgr/cephadm: re-use old ip when re-adding hosts if necessary

mgr/cephadm: re-use old ip when re-adding hosts if necessary

When a host is re-added without an explicit ip we can default to the old
ip we had stored for the host rather than either keeping the loopback
address or throwing an exception. We only want to actually error when
the only options left are error or use a resolved loopback address

Fixes: https://tracker.ceph.com/issues/53438
Signed-off-by: Adam King <adking@redhat.com>
(cherry picked from commit 7e8d8317bef1b35cddd99950e503f57710002e80)