display-accts: check for duplicate gid/uid values

Make sure people don't accidentally add a group or user with a duplicate
id.  And fix up the one case so far where this happened.

BUG=None
TEST=`./display-accts.py` no longer errors out

Change-Id: I998b3ac8ead4b4efefa10154c6614e5104734ecf
Reviewed-on: https://chromium-review.googlesource.com/317400
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
3 files changed
tree: 90d2264ac22e69538d9bc23788b5fb33f7145a63
  1. PRESUBMIT.cfg
  2. eclass/
  3. metadata/
  4. profiles/