Summary:
At the moment we can't test logging to scribe easily - we don't have a way to
mock it. Scribe are supposed to help with that.
They will let us to configure all scribe logs to go to a directory on a
filesystem similar to the way we configure scuba. The Scribe itself will
be stored in CoreContext
Reviewed By: farnz
Differential Revision: D22237730
fbshipit-source-id: 144340bcfb1babc3577026191428df48e30a0bb6
