RFR 8059949: com/sun/tools/attach/StartManagementAgent.java interrupted! (timed out?)

[Jaroslav Bachorik]

Please, review this small test adjustment

Issue : https://bugs.openjdk.java.net/browse/JDK-8059949
Webrev: http://cr.openjdk.java.net/~jbachorik/8059949/webrev.01

The test is failing very intermittently when run on fastdebug builds. In 
the diagnostic output there is no indication of any unexpected errors - 
the test just times out while trying to start the local JMX agent. This 
change is an attempt to give the test more time to finish by increasing 
the timeout.

Thanks,

-JB-