RFR 8027358: sun/management/jmxremote/bootstrap/LocalManagementTest.java failing since JDK-8004926

[Jaroslav Bachorik]

Please, review this test fix.

In agentvm mode the test can not rely on the co-location of the test 
class and the auxiliary classes the test class wants to start. It is 
necessary to explicitly provide the test class path when starting an 
external java process.

Issue : https://bugs.openjdk.java.net/browse/JDK-8027358
Webrev: http://cr.openjdk.java.net/~jbachorik/8027358/webrev.00/

Thanks,

-JB-