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/hooks.go

@@ -11,11 +11,11 @@ type Hook interface {
 }
 
 // Internal type for storing the hooks on a logger instance.
-type LevelHooks map[Level][]Hook
+type levelHooks map[Level][]Hook
 
 // Add a hook to an instance of logger. This is called with
 // `log.Hooks.Add(new(MyHook))` where `MyHook` implements the `Hook` interface.
-func (hooks LevelHooks) Add(hook Hook) {
+func (hooks levelHooks) Add(hook Hook) {
 	for _, level := range hook.Levels() {
 		hooks[level] = append(hooks[level], hook)
 	}
@@ -23,7 +23,7 @@ func (hooks LevelHooks) Add(hook Hook) {
 
 // Fire all the hooks for the passed level. Used by `entry.log` to fire
 // appropriate hooks for a log entry.
-func (hooks LevelHooks) Fire(level Level, entry *Entry) error {
+func (hooks levelHooks) Fire(level Level, entry *Entry) error {
 	for _, hook := range hooks[level] {
 		if err := hook.Fire(entry); err != nil {
 			return err