🐛 Fix flaky test_sinceRelativeRoot

[marianosimone]

Adjust the clock before querying, as mkdir and touch sometimes are so fast that make the query have the same time as clock, and not see the changes.

Fixes #1100

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[fanzeyi]

Thanks! This looks reasonable. I'll get it merge tomorrow at work.

We really should have a fake test clock mechanism in Watchman.

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@fanzeyi has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[facebook-github-bot]

@fanzeyi merged this pull request in facebook/watchman@3d7d6908090c41a22f43df2b6c7874c46b34f6fb.