RHOCP 4.x installation on bare metal fails with an error `Failed to inspect hardware. Reason: unable to start inspection`

Issue

• Errors during RHOCP installation:

  time="<DATE>T11:22:35+02:00" level=error msg="Error: could not inspect: could not inspect node, node is currently 'inspect failed' , last error was 'Failed to inspect hardware. Reason: unable to start inspection: HTTP POST https://<IP>:443/redfish/v1/Managers/iDRAC.Embedded.1/VirtualMedia/CD/Actions/VirtualMedia.InsertMedia returned code 400. Base.1.8.GeneralError: The remote file location is not accessible or reachable. Extended information: [{'Message': 'The remote file location is not accessible or reachable.', 'MessageArgs': [], 'MessageArgs@odata.count': 0, 'MessageId': 'IDRAC.2.5.RAC0904', 'RelatedProperties': [], 'RelatedProperties@odata.count': 0, 'Resolution': 'Confirm that the path and credentials to remote file are correct, and check that the iDRAC can connect to the network address.', 'Severity': 'Warning'}]'"`
  

• Errors seen in the logs on bootstrap vm machine in ironic-conductor container:

  <DATE> 09:22:27.755 1 ERROR ironic.conductor.manager [... bootstrap-user - - - -] Failed to inspect node <node>: Failed to inspect hardware. Reason: unable to start inspection: HTTP POST https://<IP>:443/redfish/v1/Managers/iDRAC.Embedded.1/VirtualMedia/CD/Actions/VirtualMedia.InsertMedia returned code 400. Base.1.8.GeneralError: The remote file location is not accessible or reachable. Extended information: [{'Message': 'The remote file location is not accessible or reachable.', 'MessageArgs': [], 'MessageArgs@odata.count': 0, 'MessageId': 'IDRAC.2.5.RAC0904', 'RelatedProperties': [], 'RelatedProperties@odata.count': 0, 'Resolution': 'Confirm that the path and credentials to remote file are correct, and check that the iDRAC can connect to the network address.', 'Severity': 'Warning'}]: ironic.common.exception.HardwareInspectionFailure: Failed to inspect hardware. Reason: unable to start inspection: HTTP POST https://<IP>:443/redfish/v1/Managers/iDRAC.Embedded.1/VirtualMedia/CD/Actions/VirtualMedia.InsertMedia returned code 400. Base.1.8.GeneralError: The remote file location is not accessible or reachable. Extended information: [{'Message': 'The remote file location is not accessible or reachable.', 'MessageArgs': [], 'MessageArgs@odata.count': 0, 'MessageId': 'IDRAC.2.5.RAC0904', 'RelatedProperties': [], 'RelatedProperties@odata.count': 0, 'Resolution': 'Confirm that the path and credentials to remote file are correct, and check that the iDRAC can connect to the network address.', 'Severity': 'Warning'}]`
  

• Ironic is trying to attach iso which points to bootstrap machine on port 80 instead of 6180.

  <DATE> 09:22:05.338 1 DEBUG sushy.connector [req-xxx bootstrap-user - - - -] HTTP request: POST https://<IP>:443/redfish/v1/Managers/iDRAC.Embedded.1/VirtualMedia/CD/Actions/VirtualMedia.InsertMedia; headers: {'Content-Type': 'application/json', 'OData-Version': '4.0'}; body: {'Image': 'http://<IP>:80/redfish/boot-<node>.iso'}; blocking: False; timeout: 60; session arguments: {}; _op /usr/lib/python3.6/site-packages/sushy/connector.py:111`