mgr/orchestrator: fix _list_services display

mgr/orchestrator: fix _list_services display

I see this error when using "ceph orchestrator service ls":

Error EINVAL: Traceback (most recent call last):
  File "/usr/lib64/ceph/mgr/orchestrator_cli/module.py", line 318, in handle_command
    return self._handle_command(inbuf, cmd)
  File "/usr/lib64/ceph/mgr/orchestrator_cli/module.py", line 330, in _handle_command
    return self._list_services(cmd)
  File "/usr/lib64/ceph/mgr/orchestrator_cli/module.py", line 165, in _list_services
    s.config_location))
AttributeError: 'ServiceDescription' object has no attribute 'config_location'

The config_locations field should be rados_config_location.

Signed-off-by: Jeff Layton <jlayton@redhat.com>