enable watchman.survive_restarts by default
enable watchman.survive_restarts by default

Summary: Changelog: The `file_watcher.watchman.survive_restarts` setting is now `true` by default. This setting is deprecated and will be removed in future versions.

Reviewed By: samwgoldman

Differential Revision: D30101176

fbshipit-source-id: 4b61d26f7c642e2f9b72df6e1691efb6aac02fff

facebook/flow,mroch/flow,mroch/flow,facebook/flow,facebook/flow,facebook/flow,mroch/flow,mroch/flow,facebook/flow,mroch/flow,facebook/flow,facebook/flow,mroch/flow,mroch/flow