RFR: 8028127: Regtest java/security/Security/SynchronizedAccess.java is incorrect [v4]

[Fernando Guallini]

> As highlighted in the bug description, The test **security/Security/SynchronizedAccess.java** have some issues:
> 
> 1. it needs to implement the sigalg, otherwise it throws java.security.NoSuchAlgorithmException . Even though it does not fail as it catches the exception, it never reaches the removeProvider loop. Also, adding an extra assertion to verify the local providers were actually removed.
> 2. It is reassigning the **provs** variable with Security.getProviders(). This will start adding/removing some of the system providers, in addition to the local providers, which it is not the test intent.
> 3. Adding othervm flag to run in isolation.
> 
> Test runs in tier2

Fernando Guallini has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains two commits:

 - added brackets, and refactor a comment and an exception message
 - Regtest java/security/Security/SynchronizedAccess.java is  incorrect.

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Changes: https://git.openjdk.org/jdk/pull/19480/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19480&range=03
  Stats: 92 lines in 1 file changed: 55 ins; 4 del; 33 mod
  Patch: https://git.openjdk.org/jdk/pull/19480.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19480/head:pull/19480

PR: https://git.openjdk.org/jdk/pull/19480