Better error message on unexpected reply
Better error message on unexpected reply

Summary:Instead of seeing

    SERVER_ERROR unexpected result (9) for version

on an unexpected reply, users now see

    SERVER_ERROR unexpected result mc_res_ok (9) for version

Reviewed By: pavlo-fb

Differential Revision: D3152003

fb-gh-sync-id: 9596d4c63ab4603de6c5d7499b32aae861928892
fbshipit-source-id: 9596d4c63ab4603de6c5d7499b32aae861928892

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