[jdk17u-dev] RFR: 8311644: Server should not send bad_certificate alert when the client does not send any certificates

[Goetz Lindenmaier]

I backport this based on the change in 21.

Trivial resolve of exception message in src/java.base/share/classes/sun/security/ssl/Alert.java

test/jdk/sun/security/ssl/SignatureScheme/SigAlgosExtTestWithTLS12.java
test/jdk/sun/security/ssl/SignatureScheme/SigAlgosExtTestWithTLS13.java
Resolved Copyright.

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Commit messages:
 - backport af0985974de246af6610faa90d7c1af5ec5addc3

Changes: https://git.openjdk.org/jdk17u-dev/pull/4274/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=4274&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8311644
  Stats: 270 lines in 8 files changed: 191 ins; 24 del; 55 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/4274.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/4274/head:pull/4274

PR: https://git.openjdk.org/jdk17u-dev/pull/4274