RFR: 8368754: runtime/cds/appcds/SignedJar.java log regex is to strict

[Axel Boldt-Christmas]

Any logging which gets enabled (via `-verbose:class` which the test uses, or externally from JTREG) and logs before the line this test is checking for with a tag set which is longer than `class,load` makes the test fail.
Example:
Test expects: 
 * `"[class,load] Hello source: [...]"`
 
What it gets when logging with `class,unload` prior to this specific log line: 
 * `"[class,load ] Hello source: [...]"`

I suggest we simply allow for any whitespace after the log tags and before the `.`. Unclear why we use `.` and not `]`. But think it works just as well.

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Commit messages:
 - 8368754: runtime/cds/appcds/SignedJar.java log regex is to strict

Changes: https://git.openjdk.org/jdk/pull/27517/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27517&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8368754
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/27517.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27517/head:pull/27517

PR: https://git.openjdk.org/jdk/pull/27517