minor refactor to SocketAcceptor
minor refactor to SocketAcceptor

Summary:
- unindent
- make sure all fields of the handshake are used by destructuring it

Changelog: [internal]

Reviewed By: SamChou19815

Differential Revision: D36596723

fbshipit-source-id: 7d28a5076475717f3a164d2d80d32766d1d025e3

mroch/flow,facebook/flow,mroch/flow,facebook/flow,mroch/flow,mroch/flow,facebook/flow,facebook/flow,mroch/flow,facebook/flow,mroch/flow,mroch/flow,facebook/flow,facebook/flow