[11u] RFR: 8228967: Trust/Key store and SSL context utilities for tests

[Baesken, Matthias]

Hello Götz, the backport looks good to me .

Best regards, Matthias

> 
> Hi,
> 
> I would like to bring this test-only change to 11.0.9.
> 
> This applies clean except for two trivial resolves:
> 
> Previously, when downporting "8234728: Some security tests should
> support TLSv1.3", I had to resolve NullHostnameCheck.java because
> this change was missing. Now, bringing this to 11u, I had to resolve the
> same location again now, obviously.
> 
> Further, I had to resolve the copyright in PacketLossRetransmission.java.
> 
> http://cr.openjdk.java.net/~goetz/wr20/8228967-ssl_test_utilities-jdk11/01/
> 
> Please review.
> https://bugs.openjdk.java.net/browse/JDK-8228967
> https://hg.openjdk.java.net/jdk/jdk/rev/d80e4bce4588
> 
> Best regards,
>   Goetz.