Add getSecurityProtocol() to MockAsyncSocket
Add getSecurityProtocol() to MockAsyncSocket

Summary: Add getSecurityProtocol() to MockAsyncSocket

Reviewed By: knekritz

Differential Revision: D15099025

fbshipit-source-id: 98b1337a9016e75eff11f37899180d323b67247c

facebook/folly,facebook/folly,facebook/folly,facebook/folly,facebook/folly