[jdk26u] RFR: 8372661: Add a null-safe static factory method to "jdk.test.lib.net.SimpleSSLContext"

[Kieran Farrell]

clean backport

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Commit messages:
 - Backport 629e4ac6f45c87898f6a014f28a443c800413869

Changes: https://git.openjdk.org/jdk26u/pull/34/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk26u&pr=34&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8372661
  Stats: 95 lines in 1 file changed: 51 ins; 5 del; 39 mod
  Patch: https://git.openjdk.org/jdk26u/pull/34.diff
  Fetch: git fetch https://git.openjdk.org/jdk26u.git pull/34/head:pull/34

PR: https://git.openjdk.org/jdk26u/pull/34