Ok, it seems that busybox tr does not actually support symbolic ranges.
Rather than add a first user of awk it seems simpler to manually expand
the character ranges.  Specifically as the specification says the
following:

    "The hexadecimal values "a" through "f" are output as lower case
characters and are case insensitive on input."

we can simply map A-F to a-f and cover all valid cases.

@manjo -- I have uploaded this fix to my ppa:apw/ubuntu/initramfs-tools-
test for testing.  Could you do one final test with that one before I
break the archive again.

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Touch seeded packages, which is subscribed to initramfs-tools in Ubuntu.
https://bugs.launchpad.net/bugs/1548120

Title:
  [xenial][initramfs-tools] support uppercase and lowercase uuids

Status in initramfs-tools package in Ubuntu:
  In Progress

Bug description:
  Initramfs tools does not support uppercase UUIDs. Initramfs-tools
  script/functions uses blkid to determine the device name from
  UUID/PARTUUID but if either of those are in uppercase blkid fails to
  return the name.

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