ReaR/UEFI: Booting the Rescue ISO fails at Grub Rescue prompt with error message "Unknown command 'configfile'"
Issue
- 
When booting the ReaR Rescue ISO on UEFI systems, the Grub Rescue prompt is entered and following message is seen
Unknown command 'configfile'. error: ../../grub-core/kern/fs.c:120:unknown filesystem Entering rescue mode... grub rescue> 
Environment
- Red Hat Entreprise Linux 7 and 8
 - rear-2.4
 - UEFI
 
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