RFR: 8353738: Update TLS unit tests to not use certificates with MD5 signatures [v6]

[Matthew Donovan]

> This PR updates tests that were using MD5 certificates. For most of the tests, I added test cases for TLSv1.2/MD5withRSA and TLSv1.3/SHA256withRSA.

Matthew Donovan has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 11 additional commits since the last revision:

 - Updated SAN methods in CertificateBuilder to take multiple names
 - Merge branch 'master' into update-md5-certs
 - removed IPIdentitites.java because it's identical to IPAddressIPIdenties; added IPv6 SAN ext
 - removed unused keystore files, fixed certificate chain
 - Merge branch 'master' into update-md5-certs
 - changed line wrapping
 - removed unnecessary comment and made getSSLContext(...) private
 - changed tests to use SecurityUtils.removeDisabled*Algs methods
 - fixed indents and copyright year
 - Merge branch 'master' into update-md5-certs
 - ... and 1 more: https://git.openjdk.org/jdk/compare/c70734d2...6579bc79

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/27342/files
  - new: https://git.openjdk.org/jdk/pull/27342/files/1aaf4247..6579bc79

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27342&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27342&range=04-05

  Stats: 300342 lines in 2569 files changed: 194979 ins; 65676 del; 39687 mod
  Patch: https://git.openjdk.org/jdk/pull/27342.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27342/head:pull/27342

PR: https://git.openjdk.org/jdk/pull/27342