Daniel Watkins dbab0a7464 Add replace_grub_root_with_label function
When update-grub is run, it will detect the disks in the build system.
Currently, we sed the grub configuration in places where this happens;
replace_grub_root_with_label moves that seddery in to a single callable
location to avoid ending up with multiple versions of it.

(It's worth noting that we also do this in 999-cpc-fixes.chroot, but as our
functions file isn't available within the chroot we don't use it there.)
2017-03-17 13:46:27 -05:00
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