RFR: 8316540: StoreReproducibilityTest fails on some locales [v2]

[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.

Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:

  Reflects review comments

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/15829/files
  - new: https://git.openjdk.org/jdk/pull/15829/files/429b2369..30b0af53

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15829&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15829&range=00-01

  Stats: 12 lines in 1 file changed: 3 ins; 8 del; 1 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