RFR S: 7127792 Add the ability to change an existing PeriodicTask's execution interval

[Rickard Bäckman]

Hi all,

can I please have a couple of reviews on the following change:

http://cr.openjdk.java.net/~rbackman/7127792/
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7127792

In short the purpose is to enable tasks to change the interval they are executed in. We 
would also like to be able to add (and remove) tasks after the WatcherThread has started.

Thanks
/R