RFR: 8316087: Test SignedLoggerFinderTest.java is still failing

[Sean Coffey]

Some log messages from the test may be dropped if the bootstraplogger is in use at time of log call. (bootstap logger logs at INFO level, the security event logger logs at DEBUG level)

Modify the test to use a patched EventHelper class to let it log at INFO level also, ensuring the bootstrap logger handles such logs.

I'll log a follow on enhancement where the default logging level for bootstrap logger can be modified (perhaps via the existing `jdk.system.logger.level` system property)

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Commit messages:
 - More whitespace
 - Whitespace correction
 - 8316087

Changes: https://git.openjdk.org/jdk/pull/15711/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15711&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316087
  Stats: 15 lines in 2 files changed: 9 ins; 3 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/15711.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15711/head:pull/15711

PR: https://git.openjdk.org/jdk/pull/15711