Updating submodules
Updating submodules

Summary:
GitHub commits:

https://github.com/facebook/fbthrift/commit/4122c30244a02e8abdf98290769faa2c7522d44a
https://github.com/facebookexternal/stl_tasks/commit/87fe488f17686d835294a9cc119ad5bc4a852cd7
https://github.com/facebookincubator/velox/commit/3a29273088170ee5531567e589d08d7e50024399

Reviewed By: jurajh-fb

fbshipit-source-id: 077ccf1a495ba625750c6f23d1dd794659168c22

facebook/bistro,facebook/bistro,facebook/bistro,facebook/bistro,facebook/bistro,facebook/bistro