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/project_ps.go

@@ -0,0 +1,28 @@
+package project
+
+import "golang.org/x/net/context"
+
+// Ps list containers for the specified services.
+func (p *Project) Ps(ctx context.Context, services ...string) (InfoSet, error) {
+	allInfo := InfoSet{}
+
+	if len(services) == 0 {
+		services = p.ServiceConfigs.Keys()
+	}
+
+	for _, name := range services {
+
+		service, err := p.CreateService(name)
+		if err != nil {
+			return nil, err
+		}
+
+		info, err := service.Info(ctx)
+		if err != nil {
+			return nil, err
+		}
+
+		allInfo = append(allInfo, info...)
+	}
+	return allInfo, nil
+}