[jdk25u-dev] RFR: 8373101: JdkClient and JdkServer test classes ignore namedGroups field

[Roland Mesde]

Backporting JDK-8373101: JdkClient and JdkServer test classes ignore namedGroups field.

This PR fixes JdkClient and JdkServer test utility classes to properly include the namedGroups field from their AbstractPeer.Builder parent class when creating/configuring objects, which was previously being ignored.

For parity with Oracle JDK.

Ran related tests on linux-x64, linux-aarch64, macos-aarch64 and windows-x64:

make test TEST=test/jdk/javax/net/ssl/TLSCommon/interop

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Commit messages:
 - Backport 1ae4a6c43ea21d4b147bcfcfaf1484c6e618dce5

Changes: https://git.openjdk.org/jdk25u-dev/pull/301/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u-dev&pr=301&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8373101
  Stats: 25 lines in 2 files changed: 22 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jdk25u-dev/pull/301.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u-dev.git pull/301/head:pull/301

PR: https://git.openjdk.org/jdk25u-dev/pull/301