Allow logging at TRACE level for a single test in the test suite

Log4J has support for filters that can allow or disallow log messages based on their properties, e.g. the thread name.

Since the names of most threads in the test suite include the test name, we should create a filter that only allows a log message if the thread name matches a regular expression.

There are some threads that don't follow this rule, e.g. the HotRod worker threads, but it should be useful in most cases.