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/docker/libcompose/project/volume.go

@@ -0,0 +1,19 @@
+package project
+
+import (
+	"golang.org/x/net/context"
+
+	"github.com/docker/libcompose/config"
+)
+
+// Volumes defines the methods a libcompose volume aggregate should define.
+type Volumes interface {
+	Initialize(ctx context.Context) error
+	Remove(ctx context.Context) error
+}
+
+// VolumesFactory is an interface factory to create Volumes object for the specified
+// configurations (service, volumes, …)
+type VolumesFactory interface {
+	Create(projectName string, volumeConfigs map[string]*config.VolumeConfig, serviceConfigs *config.ServiceConfigs, volumeEnabled bool) (Volumes, error)
+}