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_scale.go

@@ -0,0 +1,40 @@
+package project
+
+import (
+	"fmt"
+
+	"golang.org/x/net/context"
+
+	log "github.com/Sirupsen/logrus"
+)
+
+// Scale scales the specified services.
+func (p *Project) Scale(ctx context.Context, timeout int, servicesScale map[string]int) error {
+	// This code is a bit verbose but I wanted to parse everything up front
+	order := make([]string, 0, 0)
+	services := make(map[string]Service)
+
+	for name := range servicesScale {
+		if !p.ServiceConfigs.Has(name) {
+			return fmt.Errorf("%s is not defined in the template", name)
+		}
+
+		service, err := p.CreateService(name)
+		if err != nil {
+			return fmt.Errorf("Failed to lookup service: %s: %v", service, err)
+		}
+
+		order = append(order, name)
+		services[name] = service
+	}
+
+	for _, name := range order {
+		scale := servicesScale[name]
+		log.Infof("Setting scale %s=%d...", name, scale)
+		err := services[name].Scale(ctx, scale, timeout)
+		if err != nil {
+			return fmt.Errorf("Failed to set the scale %s=%d: %v", name, scale, err)
+		}
+	}
+	return nil
+}