WL#2334: Implement long-running, high load testing

Affects: Connector/J-5.2   —   Status: Code-Review   —   Priority: Medium

We currently have no long-running (i.e. days) tests or long-run,high-stress
tests for Connector/J.

We should implement tests that utilize common components that our users use
(c3p0, dbcp, hibernate) that run for days on end, at high load, and report the
results, so we can catch errors that only occur over time, or in recovery modes.