RFR[11] JDK-8205984: javax/net/ssl/compatibility/Compatibility.java failed to access port log file

[sha.jiang at oracle.com]

Hi,
The first test case in this test doesn't release resource after reading 
port from the port log file,
then the following cases couldn't access the log file.
This patch tries to fix this issue.

JBS: https://bugs.openjdk.java.net/browse/JDK-8205984
Webrev: http://cr.openjdk.java.net/~jjiang/8205984/webrev.00/

Best regards,
John Jiang