Make "bin/audit synchronize" actually save changes

Summary: Ref T10978. Although this script prints out some very good changes, it does not currently persist them to the database.

Test Plan: Ran bin/audit synchronize, saw the change appear both on the CLI and in the database.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10978

Differential Revision: https://secure.phabricator.com/D17276