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`)

integration/vendor/github.com/docker/engine-api/client/swarm_inspect.go

@@ -1,21 +0,0 @@
-package client
-
-import (
-	"encoding/json"
-
-	"github.com/docker/engine-api/types/swarm"
-	"golang.org/x/net/context"
-)
-
-// SwarmInspect inspects the Swarm.
-func (cli *Client) SwarmInspect(ctx context.Context) (swarm.Swarm, error) {
-	serverResp, err := cli.get(ctx, "/swarm", nil, nil)
-	if err != nil {
-		return swarm.Swarm{}, err
-	}
-
-	var response swarm.Swarm
-	err = json.NewDecoder(serverResp.body).Decode(&response)
-	ensureReaderClosed(serverResp)
-	return response, err
-}