Recommended update for grub2

This update for grub2 fixes the following issues:

- Implement support searching for specific config files for netboot. (bsc#1166409)

This update was imported from the SUSE:SLE-15-SP1:Update update project.

Fixed bugs
bnc#1166409
Grub netbooting does not search for grub.cfg files with mac address or ip address in filename
Selected Binaries
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