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/docker/client/secret_create.go

@@ -0,0 +1,22 @@
+package client
+
+import (
+	"encoding/json"
+
+	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/api/types/swarm"
+	"golang.org/x/net/context"
+)
+
+// SecretCreate creates a new Secret.
+func (cli *Client) SecretCreate(ctx context.Context, secret swarm.SecretSpec) (types.SecretCreateResponse, error) {
+	var response types.SecretCreateResponse
+	resp, err := cli.post(ctx, "/secrets/create", nil, secret, nil)
+	if err != nil {
+		return response, err
+	}
+
+	err = json.NewDecoder(resp.body).Decode(&response)
+	ensureReaderClosed(resp)
+	return response, err
+}