[RHV] Sanlock resouce read failure when using `rhv-image-discrepancies`

Issue

• When running rhv-image-discrepancies from the manager, the script fails on an image where the script does not find a lease:

  Traceback (most recent call last):
    File "/usr/bin/vdsm-tool", line 220, in main
      return tool_command[cmd]["command"](*args)
    File "/usr/lib/python2.7/site-packages/vdsm/tool/dump_volume_chains.py", line 92, in dump_chains
      volumes_info = _get_volumes_info(cli, parsed_args.sd_uuid)
    File "/usr/lib/python2.7/site-packages/vdsm/tool/dump_volume_chains.py", line 194, in _get_volumes_info
      storagedomainID=sd_uuid, imageID=img_uuid)
    File "/usr/lib/python2.7/site-packages/vdsm/client.py", line 303, in _call
      method, kwargs, resp.error.code, str(resp.error))
  ServerError: Command Volume.getInfo with args {'imageID': u'd317ebf6-1de4-4720-8d80-a98fca4689a1', 'storagepoolID': u'4aea60fa-b913-4766-9572-f62b01dda06c', 'volumeID': u'c3fbcb6f-8041-4d5e-aeca-51040c9539ea', 'storagedomainID': '1f3dbc90-d719-409f-81be-a1b1e7c695ce'} failed:
  (code=100, message=(-223, 'Sanlock resource read failure', 'Lease does not exist on storage'))
  Command 'ssh -i /etc/pki/ovirt-engine/keys/engine_id_rsa 10.0.0.1 vdsm-tool dump-volume-chains 1f3dbc90-d719-409f-81be-a1b1e7c695ce -o json' returned non-zero exit status 1