RFR: JDK-8344654 : Some client tests still expect a SecurityManager after JEP486

[Harshitha Onkar]

Post JEP486 test cleanup.

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

Commit messages:
 - jep486 test update

Changes: https://git.openjdk.org/jdk/pull/22371/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22371&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344654
  Stats: 183 lines in 13 files changed: 2 ins; 137 del; 44 mod
  Patch: https://git.openjdk.org/jdk/pull/22371.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22371/head:pull/22371

PR: https://git.openjdk.org/jdk/pull/22371