Revert "Rebase on top of proxygen/lib/services changes - some files were moved from proxygen->folly"

This reverts commit 6dc76d14134be66a704c2a18677d3e90812c2c87.
Revert "Revert "Rebase on top of proxygen/lib/services changes - some files were moved from proxygen->folly""

This reverts commit 5975e8d3cd64c379961e7145bdd1462fc22f5dc5.