RFR(XS): 8076998: BadHandshakeTest.java fails due to warnings in output

[Yekaterina Kantserova]

Hi,

Could I please have a review of this fix.

bug: https://bugs.openjdk.java.net/browse/JDK-8076998
webrev: http://cr.openjdk.java.net/~ykantser/8076998/webrev.00/

The test has been checking the first line of output for either 
'Listening for transport dt_socket at address:' or 'Address already in 
use'. But different VM warnings can show up before these lines. The fix 
is to read output until one of these lines is found.

Thanks,
Katja