* Add MySQL latest, MariaDB 10.2, and MariaDB latest to CI [ci mysql]

* Add upper limit to number of results returned by GET /api/search endpoint

* Rewrite tests in metabase.api.search-test to use new style

* Rework DB & test component init code so they can be retried after failing without having to restart REPL/redefine vars

* Log application DB product/version info; include in troubleshooting info

* Log DB version info when starting tests