Wait for file events to propagated for slower Listen backends.

[headius]

Summary

The tests for filesystem events ("checker" or "listen") do not wait for the Listen event loop to catch up with changes. This patch adds the waits, so they'll run green on platforms where Listen has some delay.

Other Information

On JRuby, the listen library does not have access to synchronous filesystem events, a la rb_fsevent and similar libraries. Instead, it uses a listen loop that may introduce some delay after filesystem changes before an event is fired. Other tests here used wait to wait for those changes to propagate, so I added the same wait to the remaining tests. With this change, these tests are green on JRuby.

[rails-bot]

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[rails-bot]

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