[jdk26u] RFR: 8373537: Migrate "test/jdk/com/sun/net/httpserver/" to null-safe "SimpleSSLContext" methods

[Vanitha B P]

Clean backport, All test passed.

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Commit messages:
 - Backport 14c93b2afbf0135e872866c7f8468d9ce6df1e0d

Changes: https://git.openjdk.org/jdk26u/pull/69/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk26u&pr=69&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8373537
  Stats: 52 lines in 15 files changed: 9 ins; 22 del; 21 mod
  Patch: https://git.openjdk.org/jdk26u/pull/69.diff
  Fetch: git fetch https://git.openjdk.org/jdk26u.git pull/69/head:pull/69

PR: https://git.openjdk.org/jdk26u/pull/69