RFR : JDK-8196744 : JMX: Not enough JDP packets received before timeout

[Harsha Wardhana B]

Hi All,

Please find the fix below for the Jdp test-case.

issue: https://bugs.openjdk.java.net/browse/JDK-8196028
webrev : http://cr.openjdk.java.net/~hb/8196028/webrev.00/

Fix details : The test was receiving JDP packets from other VM and hence 
the multi-cast socket was not timing-out. The default timeout handler 
was causing test to fail. Added a shutdown method that passes the test 
in case of timeout.

Thanks
Harsha