Updating submodules
Updating submodules

Summary:
GitHub commits:

https://github.com/facebook/folly/commit/d5fb10134f7caac5e4931a7932f5d689c0242457
https://github.com/facebook/rocksdb/commit/99fe4c5005df69a25c05966b078e5af60495dc26
https://github.com/facebookexternal/stl_tasks/commit/99aba9c84c04a211a9853b9c7713f537243e6faa

Reviewed By: bigfootjon

fbshipit-source-id: 432be255841e81d135e7eb88a83630cd99164676

facebook/wangle,facebook/wangle,facebook/wangle