RFR: Improve cooldown test stability

[Robin Westberg]

Hi all,

Please review this small change that avoids spurious failures in the cooldown retry tests.

Best regards,
Robin

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Commits:
 - 2e842424: Improve cooldown test stability

Changes: https://git.openjdk.java.net/skara/pull/426/files
 Webrev: https://webrevs.openjdk.java.net/skara/426/webrev.00
  Stats: 6 lines in 1 file changed: 6 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/skara/pull/426.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/426/head:pull/426

PR: https://git.openjdk.java.net/skara/pull/426