Allow for non-javabean attribute

[dain]

We should support non-javabean attributes like:

ThreadPoolExecutor.allowsCoreThreadTimeOut
ThreadPoolExecutor.allowCoreThreadTimeOut(true)

[johngmyers]

How would jmxutils know it is an attribute? How would it distinguish ThreadPoolExecutor.allowsCoreThreadTimeOut() from ThreadPoolExecutor.prestartCoreThread()?