support resizing partition and rootfs on system booted without initramfs.

When booted without an initramfs, the root device will be /dev/root, not a
named device. There is partial support for this when resizing filesystems,
but not for growing partitions, without which it doesn't do much good. Move
the /dev/root resolution code to util.py and use it from cc_growpart.py.

Also, booting without an initramfs only works with a root= argument that's
either a kernel device name (which is unstable) or a partition UUID. Handle
the case of root=PARTUUID=value, not just LABEL and UUID.

LP: #1677376

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