Re-think integration vendoring

- remove docker/docker from  Traefik vendor (unused)
- use `ignore` for all Traefik vendor in integration glide.
- defined only integration specific version of the dependencies.

integration/vendor/github.com/Sirupsen/logrus/terminal_notwindows.go

@@ -3,8 +3,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build linux darwin freebsd openbsd netbsd dragonfly
-// +build !appengine
+// +build linux darwin freebsd openbsd
 
 package logrus
 
@@ -13,9 +12,9 @@ import (
 	"unsafe"
 )
 
-// IsTerminal returns true if stderr's file descriptor is a terminal.
+// IsTerminal returns true if the given file descriptor is a terminal.
 func IsTerminal() bool {
-	fd := syscall.Stderr
+	fd := syscall.Stdout
 	var termios Termios
 	_, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlReadTermios, uintptr(unsafe.Pointer(&termios)), 0, 0, 0)
 	return err == 0