Re-enable MySQL 8.0 unit test
Re-enable MySQL 8.0 unit test

Fetch MariaDB 10.1 from MariaDB repos (works more consistently)

Signed-off-by: Morgan Tocker <cfa41afc5ac20f7c1e01316e2d765e1ba4c4bf7a@gmail.com>

vitessio/vitess,tinyspeck/vitess,vitessio/vitess,vitessio/vitess,mahak/vitess,mahak/vitess,mahak/vitess,vitessio/vitess,tinyspeck/vitess,vitessio/vitess,mahak/vitess,tinyspeck/vitess,vitessio/vitess,vitessio/vitess,tinyspeck/vitess,mahak/vitess,tinyspeck/vitess,vitessio/vitess,tinyspeck/vitess,mahak/vitess,tinyspeck/vitess,mahak/vitess,mahak/vitess