checking for req.socket.servername on plain sockets #18

Should first check for req.socket.encrypted

        } else if (safehost && !gl.middleware.sanitizeHost._skip_fronting_check) {
          // TODO how to handle wrapped sockets, as with telebit?
          console.warn(safehost, typeof req.socket.servername, req.servername, req.socket.servername, req.socket.encrypted);
          console.warn("\n\n\n[greenlock] WARN: no string for req.socket.servername,"
            + " skipping fronting check for '" + safehost + "'\n\n\n");

Fixed in v2.4.8