Update traefik dependencies (docker/docker and related) (#1823)

Update traefik dependencies (docker/docker and related)

- Update dependencies
- Fix compilation problems
- Remove vdemeester/docker-events (in docker api now)
- Remove `integration/vendor`
- Use `testImport`
- update some deps.
- regenerate the lock from scratch (after a `glide cc`)

integration/vendor/github.com/libkermit/docker/stop.go

@@ -1,22 +0,0 @@
-package docker
-
-import (
-	"time"
-
-	"golang.org/x/net/context"
-)
-
-// Stop stops the container with a default timeout.
-func (p *Project) Stop(containerID string) error {
-	return p.StopWithTimeout(containerID, DefaultStopTimeout)
-}
-
-// StopWithTimeout stops the container with the specified timeout.
-func (p *Project) StopWithTimeout(containerID string, timeout int) error {
-	timeoutDuration := time.Duration(timeout) * time.Second
-	if err := p.Client.ContainerStop(context.Background(), containerID, &timeoutDuration); err != nil {
-		return err
-	}
-
-	return nil
-}