Beam: convenience functions Listen and Connect

These convenience functions expose a familiar face to the unknown and bizarre world of beam networking.

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)

beam/unix.go

@@ -1,10 +1,10 @@
 package beam
 
 import (
-	"syscall"
 	"fmt"
 	"net"
 	"os"
+	"syscall"
 )
 
 // Send sends a new message on conn with data and f as payload and
@@ -100,7 +100,6 @@ func sendUnix(conn *net.UnixConn, data []byte, fds ...int) error {
 	return err
 }
 
-
 func extractFds(oob []byte) (fds []int) {
 	scms, err := syscall.ParseSocketControlMessage(oob)
 	if err != nil {