RFR: 8338380: Update TLSCommon/interop/AbstractServer to specify an interface to listen for connections

[Matthew Donovan]

This is a small PR to extend the AbstractServer class in test/jdk/javax/net/ssl/TLSCommon/interop/ to enable users to specify a specific interface on which to listen for incoming connections. The default interface is now the loopback interface. The derived class, JdkServer, is also updated to use the interface specified in AbstractServer.

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Commit messages:
 - 8338380: Update TLSCommon/interop/AbstractServer to specify an interface to listen for connections

Changes: https://git.openjdk.org/jdk/pull/20581/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20581&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8338380
  Stats: 15 lines in 2 files changed: 14 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/20581.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20581/head:pull/20581

PR: https://git.openjdk.org/jdk/pull/20581