[jdk17] RFR: 8269025: jsig/Testjsig.java doesn't check exit code

[Igor Ignatyev]

Hi all,

could you please review this small trivial test-only change that adds a check of exit code to `jsig/Testjsig.java` test?

Thanks,
-- Igor

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Commit messages:
 - update copyright
 - 8269025

Changes: https://git.openjdk.java.net/jdk17/pull/98/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17&pr=98&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8269025
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk17/pull/98.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17 pull/98/head:pull/98

PR: https://git.openjdk.java.net/jdk17/pull/98