RFR: CODETOOLS-7902975: jcstress: JDK 17 cannot cleanly compile due to SecurityManager deprecation

[Aleksey Shipilev]

Look at the bug for the build failure log.

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Commit messages:
 - Remove remaining uses of java.security
 - Remove SecurityManager uses

Changes: https://git.openjdk.java.net/jcstress/pull/78/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jcstress&pr=78&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7902975
  Stats: 31 lines in 2 files changed: 13 ins; 15 del; 3 mod
  Patch: https://git.openjdk.java.net/jcstress/pull/78.diff
  Fetch: git fetch https://git.openjdk.java.net/jcstress pull/78/head:pull/78

PR: https://git.openjdk.java.net/jcstress/pull/78