Write BMTCleanUp tests for web-apps

We need to port the BMTCleanUp tests described on JBAS-4487 to web applications.
The fix has already been applied to the CachedConnectionValve.

The difficulty is that Tomcat does not provide a way to guarantee that two requests will occur on the same thread.

One possiblity is to deploy an additional connector on a different tcp/ip port with a max thread pool size of 1
just for this test.