RFR 8171426 : java/lang/ProcessBuilder/Basic.java failed with Stream closed

[Roger Riggs]

Please review a test update to address an intermittent test failure.
The test is modified to accept the current implementation behavior of 
the input streams
from processes that may under race conditions with close throw 
IOE("Stream closed").

Details and analysis in the Jira:
   https://bugs.openjdk.java.net/browse/JDK-8171426

Webrev:
   http://cr.openjdk.java.net/~rriggs/webrev-basic-8171426/

Thanks, Roger