RFR(XS): 8056994: sun/tools/jstatd/TestJstatdPortAndServer.java and sun/tools/jstatd/TestJstatdServer.java miss correct check of RMI server availability

[Yekaterina Kantserova]

Hi,

Could I please have a review of this small fix.

webrev: http://cr.openjdk.java.net/~ykantser/8056994/webrev.00/
bug: https://bugs.openjdk.java.net/browse/JDK-8056994

Thanks,
Katja