initrd.gz - grub2 'root=' support for /init and /sbin/isoboot - please check

[gyrog]

There is support for grub2's 'root=' boot parameter in /sbin/init_full_install but not in /init or /sbin/isoboot.
I have a couple of patches to provide this support.

The attached file:
initrd-root.tar.gz
contains the patches as .diff files, 'init_root.diff' and 'iso_root.diff',
and a 'local-initrd.gz' containing the 2 patched files.

This can be tested by adding the 'local-initrd.gz' to a Puppy frugal install directory,
provided the grub2 bootentry supports 'local-initrd.gz', (boot entries generated by FrugalPup do).

You can check that the patched 'init' has been used for a boot, by the first line of /initrd/tmp/bootinit.log.
It should be 'Testing "root=" boot parameter'.

I would hope for more testing other than "It works for me", before I think about commiting the patches to woof-ce.

Since the patches add a new facility,
the primary test is that it doesn't break any existing facility.

Obviously I've tested it in my environment, but there are heaps of facilities in 'init' that I never use.