Add "find_new_uid" script.

This script automates the process of finding a new UID to use by examing
all currently-in-use UIDs.

BUG=None
TEST=Manually ran script and verified that output was correct.

Change-Id: If09aff0b4f3c01a30d8de949a3caa35600ece63f
Reviewed-on: https://chromium-review.googlesource.com/1600372
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Miriam Zimmerman <mutexlox@chromium.org>
Reviewed-by: LaMont Jones <lamontjones@chromium.org>
2 files changed
tree: b5e42af9d1ef9c3a01c435390e1528483fa4f637
  1. PRESUBMIT.cfg
  2. eclass/
  3. metadata/
  4. profiles/