Summary: Technically we should have these for all the OAuth providers but I don't think anyone really has trouble with them and it can probably be done generically after T1536. Preserve the functionality, at least.
Test Plan: Broke my config, verified warnings appeared.
Reviewers: btrahan, vrana
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T2228
Differential Revision: https://secure.phabricator.com/D4506
