RFR: 8316540: StoreReproducibilityTest fails on some locales

[Naoto Sato]

Fixing a test case that fails in some time zones. Making sure the test is run in `UTC` zone will fix the issue. Confirmed the fix by manually setting machine's time zone to Europe/Dublin.

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Commit messages:
 - initial commit

Changes: https://git.openjdk.org/jdk/pull/15829/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15829&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316540
  Stats: 15 lines in 1 file changed: 9 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/15829.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15829/head:pull/15829

PR: https://git.openjdk.org/jdk/pull/15829