Updating submodules
Updating submodules

Summary:
GitHub commits:

https://github.com/facebook/fbthrift/commit/94f35f3c265476fc11e5520040edc9f9bf0053d2
https://github.com/facebook/rocksdb/commit/f28d0c2020d0314e66aed240f379f2a795b6c940
https://github.com/facebookincubator/velox/commit/42b5e413f9357c019176bce25ef95fb53a5d04b4

Reviewed By: bigfootjon

fbshipit-source-id: 73cdda4396ef1c76889df9d5e1e7a452e5d1829b

facebook/watchman,facebook/watchman,facebook/watchman,facebook/watchman,facebook/watchman,facebook/watchman,facebook/watchman,facebook/watchman,facebook/watchman