jmx-dev RFR 8044427: [test] sun/management/jmxremote/startstop/JMXStartStopTest times out intermittently on Solaris/Sparcv9

[Jaroslav Bachorik]

Please, review this simple test fix.

Issue : https://bugs.openjdk.java.net/browse/JDK-8044427
Webrev: http://cr.openjdk.java.net/~jbachorik/8044427/webrev.00

The test fails intermittently on Solaris 10 / Sparcv9 with timeout 
signalled after 480s. The investigation shows that the Sparcv9 Solaris 
test machines are particularly slow when starting a JVM. This test 
starts up a new JVM 13 times and when the system is otherwise busy the 
test can not be finished in 480s.

The proposed fix is to increase the test timeout due to the intensive 
JVM process creation. The increased timeout does not affect the regular 
test runs - there are no endless loops relying on the harness to 
interrupt them.

Thanks,

-JB-