RFR: 8346468: SM cleanup of common test library

[Roger Riggs]

SM Cleanup of common test library test/lib/...:

Remove unnecessary catches of SecurityException
Remove AccessController and doPrivileged from SimpleSSLContext and ProcessTools.

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Commit messages:
 - 8346468: SM cleanup of common test library

Changes: https://git.openjdk.org/jdk/pull/22814/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22814&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8346468
  Stats: 85 lines in 4 files changed: 0 ins; 59 del; 26 mod
  Patch: https://git.openjdk.org/jdk/pull/22814.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22814/head:pull/22814

PR: https://git.openjdk.org/jdk/pull/22814