RFR: JDK-8203026: java.rmi.NoSuchObjectException: no such object in table

[gary.adams at oracle.com]

Here's a proposed fix for the intermittent jstatd test failure.
By moving the exported object from a local method variable to a
static class variable a strong reference is held so the object
will not be garbage collected prematurely.

   Webrev: http://cr.openjdk.java.net/~gadams/8203026/webrev.00/
   Issue: https://bugs.openjdk.java.net/browse/JDK-8203026

The test is currently filed as a core-libs/java.rmi, but it probably
should be core-svc/tools with label=jstatd. It is the callers
responsibility to ensure the strong reference to prevent
the premature garbage collection, so this is a test failure
rather than a need to change the underlying rmi behavior.