Patch for export IP addresses from PXE into grub2 enviroment variables

[Aleš Kapica]

Could I ask you for apply patch from attachment on pxecmd.c in grub2, please? 
It's adding an option -s to the command pxe, which do make possible set IP 
addresses of the server and the client machine, got from PXE, among grub2 
enviroment variables.
DHCP gives IP according to MAC address, and we use it to identify the client 
station by IP address.

Thanks a lot, with regards Aleš Kapica

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set_pxeinfo_into_enviroment_variables.diff
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