Generate expected schemata for MetaMTA, Nuance, MetaData, OAuthServer

Summary: Ref T1191. Handful of minor things here (T6150, T6149, T6148, T6147, T6146) but nothing very noteworthy.

Test Plan: Viewed web UI, saw fewer errors.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T1191

Differential Revision: https://secure.phabricator.com/D10527