crostestutils: Initial helper script to update METADATA in tauto

A script which, when run locally in a repo, will make local edits
to tauto control files matching the desired parameters.

The only functionality implemented here is:
- removing given emails from 'contacts'
- modifying only specific tests

BUG=None
TEST=tests included; also used it to remove invalid emails

Change-Id: Idf88765d3dab932b8481fc24c069e17128fa4b85
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crostestutils/+/4671169
Commit-Queue: Katherine Threlkeld <kathrelkeld@chromium.org>
Tested-by: Katherine Threlkeld <kathrelkeld@chromium.org>
Reviewed-by: Jesse McGuire <jessemcguire@google.com>
Reviewed-by: Afshin Sadrieh <asadrieh@google.com>
11 files changed