RFR: Fix race condition in mailman cache test

[Erik Helin]

On Thu, 16 Jan 2020 08:56:37 GMT, Robin Westberg <rwestberg at openjdk.org> wrote:

> Hi all,
> 
> Please review this small change that fixes a race condition in the mailman cache test.
> 
> Best regards,
> Robin

Looks good, thanks for catching this!

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Marked as reviewed by ehelin (Reviewer).

PR: https://git.openjdk.java.net/skara/pull/358