Failed to deploy overcloud when UEFI boot is enabled and HP iLO is used

Issue

• Overcloud deployment failed with the following error.

  ResourceInError: resources.ComputeSriov: Went to status ERROR due to "Message: Exceeded maximum number of retries. Exhausted all hosts available for retrying build failures for instance aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa., Code: 500"
  

• Overcloud nodes show NBP filesize is 0 Bytes in their console during the deployment.

  >>Start PXE over IPv4
       Station IP address is 10.0.0.1
  
       Server IP address is 10.0.0.2
       NBP filename is ipxe.efi <===========(*)
       NBP filesize is 0 Bytes <============(*)
  

• UEFI boot is enabled on overcloud nodes.

• Introspection succeeded without error.

• This issue didn't occur on Red Hat OpenStack Platform 16.2.2.