Summary: Pends the freeing of the internal SSL until the socket is finally destroyed. This ensures that the async job can write out the result and call the socket's callback. This also always calls restartSSLAccept in order to let it handle errors and cleaning up of async jobs.

Reviewed By: knekritz

Differential Revision: D9599917

fbshipit-source-id: 8c4ce8b762fe59f08c2a40e76a0bebe59cd2929e