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`)

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

@@ -0,0 +1,22 @@
+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
+}