#817 moved the junit runner code into the hawtio-junit module and create an mbean we can use to detect whether or not we should show the JUnit plugin (and include it in the maven plugin)
#817 add hawtio-junit to test scope in hawtio-web for easier testing via "mvn test-compile exec:java"
#817 show the JUnit tab if there exists the junit mbean (and the introspector); whatever the current JMX tree selection ;)