Make sure maybeSuggestRaisingWatchLimit runs in a Fiber.
Make sure maybeSuggestRaisingWatchLimit runs in a Fiber.

Should fix recent test failures:
https://circleci.com/gh/meteor/meteor/4570#tests/containers/5
https://circleci.com/gh/meteor/meteor/4570#tests/containers/6

Hansoft/meteor,Hansoft/meteor,Hansoft/meteor,Hansoft/meteor,Hansoft/meteor,Hansoft/meteor,Hansoft/meteor