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/logrus.go

@@ -3,7 +3,6 @@ package logrus
 import (
 	"fmt"
 	"log"
-	"strings"
 )
 
 // Fields type, used to pass to `WithFields`.
@@ -34,7 +33,7 @@ func (level Level) String() string {
 
 // ParseLevel takes a string level and returns the Logrus log level constant.
 func ParseLevel(lvl string) (Level, error) {
-	switch strings.ToLower(lvl) {
+	switch lvl {
 	case "panic":
 		return PanicLevel, nil
 	case "fatal":
@@ -53,16 +52,6 @@ func ParseLevel(lvl string) (Level, error) {
 	return l, fmt.Errorf("not a valid logrus Level: %q", lvl)
 }
 
-// A constant exposing all logging levels
-var AllLevels = []Level{
-	PanicLevel,
-	FatalLevel,
-	ErrorLevel,
-	WarnLevel,
-	InfoLevel,
-	DebugLevel,
-}
-
 // These are the different logging levels. You can set the logging level to log
 // on your instance of logger, obtained with `logrus.New()`.
 const (
@@ -85,11 +74,7 @@ const (
 )
 
 // Won't compile if StdLogger can't be realized by a log.Logger
-var (
-	_ StdLogger = &log.Logger{}
-	_ StdLogger = &Entry{}
-	_ StdLogger = &Logger{}
-)
+var _ StdLogger = &log.Logger{}
 
 // StdLogger is what your logrus-enabled library should take, that way
 // it'll accept a stdlib logger and a logrus logger. There's no standard
@@ -107,37 +92,3 @@ type StdLogger interface {
 	Panicf(string, ...interface{})
 	Panicln(...interface{})
 }
-
-// The FieldLogger interface generalizes the Entry and Logger types
-type FieldLogger interface {
-	WithField(key string, value interface{}) *Entry
-	WithFields(fields Fields) *Entry
-	WithError(err error) *Entry
-
-	Debugf(format string, args ...interface{})
-	Infof(format string, args ...interface{})
-	Printf(format string, args ...interface{})
-	Warnf(format string, args ...interface{})
-	Warningf(format string, args ...interface{})
-	Errorf(format string, args ...interface{})
-	Fatalf(format string, args ...interface{})
-	Panicf(format string, args ...interface{})
-
-	Debug(args ...interface{})
-	Info(args ...interface{})
-	Print(args ...interface{})
-	Warn(args ...interface{})
-	Warning(args ...interface{})
-	Error(args ...interface{})
-	Fatal(args ...interface{})
-	Panic(args ...interface{})
-
-	Debugln(args ...interface{})
-	Infoln(args ...interface{})
-	Println(args ...interface{})
-	Warnln(args ...interface{})
-	Warningln(args ...interface{})
-	Errorln(args ...interface{})
-	Fatalln(args ...interface{})
-	Panicln(args ...interface{})
-}