RFR 8080138: sun/management/jmxremote/startstop/JMXStartStopTest.java failed with java.lang.Error intermittently

[Jaroslav Bachorik]

Please, review the following test change

Issue : https://bugs.openjdk.java.net/browse/JDK-8080138
Webrev: http://cr.openjdk.java.net/~jbachorik/8080138/webrev.00

The test is using DCMD to turn on the management agent. It seems that 
under certain conditions the time needed to actually startup the agent 
the RMI connector may be longer than expected and the test will try to 
connect to the target process while the initialization is still in 
progress. This will lead to intermittent failures with EOFException as 
the cause.

The patch adds a retry logic that will keep on trying to connect to the 
target process for a certain amount of time (adjusted by the test suite 
timeout factor) and fails only if the target process is not responding 
after this time has elapsed.

Thanks,

-JB-