RFR: 8345133: Test sun/security/tools/jarsigner/TsacertOptionTest.java failed: Warning found in stdout

[Matthew Donovan]

I was unable to recreate the error but it is probably the same root cause as JDK-8337951  (https://github.com/openjdk/jdk/pull/20728).

I updated the gencert command to explicitly set the start date to ensure the certificate is valid.

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Commit messages:
 - 8345133: Test sun/security/tools/jarsigner/TsacertOptionTest.java failed: Warning found in stdout

Changes: https://git.openjdk.org/jdk/pull/22592/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22592&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8345133
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/22592.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22592/head:pull/22592

PR: https://git.openjdk.org/jdk/pull/22592