[jdk21u-dev] RFR: 8311644: Server should not send bad_certificate alert when the client does not send any certificates

[Goetz Lindenmaier]

I backport this as prereq of JDK-8350807.

Resolved import in test file TLSBase.java

Tests all pass.

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Commit messages:
 - backport f62b5789add23adda2634a1cfb80f48b4387be74

Changes: https://git.openjdk.org/jdk21u-dev/pull/2069/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2069&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8311644
  Stats: 211 lines in 7 files changed: 132 ins; 24 del; 55 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2069.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2069/head:pull/2069

PR: https://git.openjdk.org/jdk21u-dev/pull/2069