Update illumos to boot with GRUB 2 and GPT label boot support

by Harshit Jain for illumos

This project will be about updating the GRUB of illumos from version 0.97 to 1.99. This will include fixing bootadm and beadm so that these commands update GRUB 2 configuration. Another part of this project will be adding support to boot from GPT (GUID Partition Table) on PC/BIOS to overcome the limitations of MBR partition table.