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/container.go

@@ -0,0 +1,13 @@
+package project
+
+import (
+	"golang.org/x/net/context"
+)
+
+// Container defines what a libcompose container provides.
+type Container interface {
+	ID() string
+	Name() string
+	Port(ctx context.Context, port string) (string, error)
+	IsRunning(ctx context.Context) bool
+}