[ticket/11576] MySQL unit tests: Enable STRICT_TRANS_TABLES and others.

PHPBB3-11576
Merge remote-tracking branch 'bantu/ticket/11576' into develop-olympus

* bantu/ticket/11576:
  [ticket/11576] MySQL unit tests: Enable STRICT_TRANS_TABLES and others.
Merge branch 'develop-olympus' into develop

* develop-olympus:
  [ticket/11576] MySQL unit tests: Enable STRICT_TRANS_TABLES and others.