Fixed typo in Darwin termios settings

docker/termios_darwin.go

@@ -3,6 +3,6 @@ package main
 import "syscall"
 
 const (
-	getTermios = syscall.TCIOGETA
-	setTermios = syscall.TCIOSETA
+	getTermios = syscall.TIOCGETA
+	setTermios = syscall.TIOCSETA
 )