[11u] RFR: 8256818: SSLSocket that is never bound or connected leaks socket resources

[Alex Kashchenko]

Hi,

Please review the backport of JDK-8256818 to 11u:

Bug: https://bugs.openjdk.java.net/browse/JDK-8256818

Original change: https://github.com/openjdk/jdk/commit/93b6ab56

11u webrev: https://cr.openjdk.java.net/~akasko/jdk11u/8256818/webrev.00/

Patch depends on JDK-8240704 [1], that applies cleanly and is on approval.

Patch doesn't apply cleanly: FileUtils.java in 11u doesn't contain
recent changes from mainline and needed adjustments; libFileUtils.c
cannot be placed into test/lib/ because 11u doesn't have JDK-8248667
[2], it is placed under test/jdk/native_util/ instead. Testing:
checked that changed tests pass on Linux and Windows, ran
jtreg:jdk/sun/security/ssl/ and jck:api/javax_net/ssl .

I also intend to backport subsequent updates to SSLSocketLeak.java
from mainline.


[1] https://bugs.openjdk.java.net/browse/JDK-8240704
[2] https://bugs.openjdk.java.net/browse/JDK-8248667

-- 
-Alex