EventHandler::initHandler to NetworkSocket
EventHandler::initHandler to NetworkSocket

Summary: Convert calls from the file descriptor overload to the NetworkSocket overload.

Reviewed By: yfeldblum

Differential Revision: D13417908

fbshipit-source-id: 7e6c46ba0b50e0c0185ddc167669d948b832f0f8

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