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/logger/null.go

@@ -0,0 +1,42 @@
+package logger
+
+import (
+	"io"
+)
+
+// NullLogger is a logger.Logger and logger.Factory implementation that does nothing.
+type NullLogger struct {
+}
+
+// Out is a no-op function.
+func (n *NullLogger) Out(_ []byte) {
+}
+
+// Err is a no-op function.
+func (n *NullLogger) Err(_ []byte) {
+}
+
+// CreateContainerLogger allows NullLogger to implement logger.Factory.
+func (n *NullLogger) CreateContainerLogger(_ string) Logger {
+	return &NullLogger{}
+}
+
+// CreateBuildLogger allows NullLogger to implement logger.Factory.
+func (n *NullLogger) CreateBuildLogger(_ string) Logger {
+	return &NullLogger{}
+}
+
+// CreatePullLogger allows NullLogger to implement logger.Factory.
+func (n *NullLogger) CreatePullLogger(_ string) Logger {
+	return &NullLogger{}
+}
+
+// OutWriter returns the base writer
+func (n *NullLogger) OutWriter() io.Writer {
+	return nil
+}
+
+// ErrWriter returns the base writer
+func (n *NullLogger) ErrWriter() io.Writer {
+	return nil
+}