When network booting a system, there is grub.cfg file used to chainload to local disk upon system installation.
The template needs to be updated to make sure software raid systems and/or VMWare systems can chainload successfully.

The solution consists in:
- calling a new "connectefi scsi" command prior to searching for local disk boot loader (e.g. "search --file ... /EFI/BOOT/BOOTX64.EFI")
- modifying "search --file" commmand to restrict to EFI disks ("search --file --efidisk-only ... /EFI/BOOT/BOOTX64.EFI")