Include the test name in the test thread names

Some random failures are much easier to reproduce when running the entire core test suite, which runs 15 tests in paralle, than when running a single test by itself. In such cases, it helps if we can filter the log messages that belong to the failing test, and the easiest way to do that is to include the test name in the thread name.

Essentially, this means replacing ExecutorService instances with AbstractInfinispanTest.fork(), and where not possible instantiating the executor with AbstractInfinispanTest.getTestThreadFactory().