Enabled tcp zero copy when any wb in batch qualifies for zero copy
Enabled tcp zero copy when any wb in batch qualifies for zero copy

Summary: Enabled tcp zero copy when any wb in batch qualifies for zero copy

Reviewed By: andreazevedo

Differential Revision: D14152374

fbshipit-source-id: fdb4406cf44a415f087a7e545d7f9d5fcf868faa

facebook/mcrouter,facebook/mcrouter,facebook/mcrouter,facebook/mcrouter