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/google/go-github/github/users_gpg_keys.go

@@ -43,7 +43,7 @@ type GPGEmail struct {
 // ListGPGKeys lists the public GPG keys for a user. Passing the empty
 // string will fetch keys for the authenticated user. It requires authentication
 // via Basic Auth or via OAuth with at least read:gpg_key scope.
-
+//
 // GitHub API docs: https://developer.github.com/v3/users/gpg_keys/#list-gpg-keys-for-a-user
 func (s *UsersService) ListGPGKeys(ctx context.Context, user string, opt *ListOptions) ([]*GPGKey, *Response, error) {
 	var u string