[jdk17u-dev] RFR: 8351567: Jar Manifest test ValueUtf8Coding produces misleading diagnostic output

[Goetz Lindenmaier]

I backport this for parity with 17.0.18-oracle

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Commit messages:
 - Backport ffa63409884e9a2d41f5223ab5962980edbb008c

Changes: https://git.openjdk.org/jdk17u-dev/pull/3906/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3906&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8351567
  Stats: 6 lines in 1 file changed: 0 ins; 4 del; 2 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3906.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3906/head:pull/3906

PR: https://git.openjdk.org/jdk17u-dev/pull/3906