Sqlite compatibility

Wikimedia Jenkins uses the SQLite database backend which has no schema
in CreditsSource. MediaWiki handles the translations from MySQL to
Sqlite just fine, so reuse the MySQL schema.

Bug: 65877
Change-Id: Ifd8379e16f3bda9a02759364167816ac77c2817a
(cherry picked from commit 67113ff5f2f72824d901716b5d344bae6dbaacb7)