redfish-virtualmedia fails on xFusion nodes

 When trying to onboard a xFusion baremetal node using redfish-virtual media (no provisioning network), it fails after the node registration with this error:

Normal InspectionError 60s metal3-baremetal-controller Failed to inspect hardware. Reason: unable to start inspection: The attribute Links/ManagedBy is missing from the resource /redfish/v1/Systems/1

    4.14.18

    Just add a xFusion baremetal node, specifing in the manifest

Spec: 
  Automated Cleaning Mode: metadata 
  Bmc: 
    Address: redfish-virtualmedia://w.z.x.y/redfish/v1/Systems/1 
    Credentials Name: hu28-tovb-bmc-secret 
    Disable Certificate Verification: true 
  Boot MAC Address: 9C:7D:A3:0E:42:8A 
  Boot Mode: UEFI Online: false 
  Preprovisioning Network Data Name: openstack-hu28-tovb-network-config-secret

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    Inspection fails with afore mentioned error, no preprovisioning image is mounted on the hoste virtualmedia

    VirtualMedia get mounted and inspection starts.