Remove ssl handshake thread pool methods
Remove ssl handshake thread pool methods

Reviewed By: yfeldblum

Differential Revision: D28354688

fbshipit-source-id: f8ffa78ba310493785f061ac504c80df9d2f6600

facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift