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_pull.go

@@ -0,0 +1,16 @@
+package project
+
+import (
+	"golang.org/x/net/context"
+
+	"github.com/docker/libcompose/project/events"
+)
+
+// Pull pulls the specified services (like docker pull).
+func (p *Project) Pull(ctx context.Context, services ...string) error {
+	return p.forEach(services, wrapperAction(func(wrapper *serviceWrapper, wrappers map[string]*serviceWrapper) {
+		wrapper.Do(nil, events.ServicePullStart, events.ServicePull, func(service Service) error {
+			return service.Pull(ctx)
+		})
+	}), nil)
+}