RFR: 8024613 javax/management/remote/mandatory/connection/RMIConnector_NPETest.java failing intermittently

[Jaroslav Bachorik]

Please, review the following change for JDK-8024613

Issue: https://bugs.openjdk.java.net/browse/JDK-8024613
Webrev: http://cr.openjdk.java.net/~jbachorik/8024613/webrev.00/ 
<http://cr.openjdk.java.net/%7Ejbachorik/8024613/webrev.00/>

The patch takes care of intermittent test failures caused by timing 
issues when starting the RMID process. It could happen that the RMID 
process hasn't been properly initialized in the timeframe of 5 seconds 
and the test would fail.

The patch replaces the home-brewed RMID process management with the one 
available in the RMI Testlibrary which is used by more tests and 
therefore should be more stable.

Thanks,

-JB-