* Added stress test, which uses TCP proxy to simulate flaky connections
* Added test code for mysql and mariadb drivers
* Dropped trying to figure out support for mariasql driver
* Bunch of tests to make knex fail if connections are breaking randomly
* Added marker to printout logs before app crash
* Fixed mysql acquire connection and destroy conneciton code
Acquire connection did bind error handler too late and didn't free it on success. Destroy did free event listeners before connection end was called, so error during connection end leaked out.
