Upload the diff number in the global metadata
Upload the diff number in the global metadata

Summary: Append the hash when possible to the metadata from the flipper submissions.

Differential Revision: D25283309

fbshipit-source-id: 1e95cdc3e9f2f1a08dc53c746732c46969166d97

facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper