RFR 8145417: JInfoSanityTest failed with Error attaching to remote server: java.rmi.ConnectException: Connection refused

[Jaroslav Bachorik]

Please, review the following simple test change

Issue : https://bugs.openjdk.java.net/browse/JDK-8145417
Webrev: http://cr.openjdk.java.net/~jbachorik/8145417/webrev.00

The affected tests check for 'Unknown host' in stderr. In some 
situations this line may not appear, although an alternative error 
indicating unavailability of the target host is thrown, and it is 
necessary to make the error matching more robust (eg. checking also for 
'Connection refused to host:' message).

Thanks,

-JB-