Updating farva to use smart reloading.
Updating farva to use smart reloading.

This version of farva only reloads nginx when the configuration has changed.
The intent here was to avoid unncessary connection draining / blips when
nginx needs to reload. See:
https://github.com/bcwaldon/farva/commit/b61d171ee1b20f8c19f59935cb52e45c400dc218

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