[jdk17u-dev] RFR: 8346285: Update jarsigner compatibility test for change in default digest algorithm

[Paul Hohensee]

Backport for Oracle 17.0.16 parity. Clean backport, test only, modified test passes.

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Commit messages:
 - Backport e7d21fcf4949106e89afd413e9abc47d622dd47a

Changes: https://git.openjdk.org/jdk17u-dev/pull/3613/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3613&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8346285
  Stats: 10 lines in 1 file changed: 7 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3613.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3613/head:pull/3613

PR: https://git.openjdk.org/jdk17u-dev/pull/3613