Re-think integration vendoring

- remove docker/docker from  Traefik vendor (unused)
- use `ignore` for all Traefik vendor in integration glide.
- defined only integration specific version of the dependencies.

integration/vendor/github.com/gambol99/go-marathon/update_strategy.go

@@ -1,23 +0,0 @@
-/*
-Copyright 2014 Rohith All rights reserved.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-	http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package marathon
-
-// UpgradeStrategy is upgrade strategy applied to a application
-type UpgradeStrategy struct {
-	MinimumHealthCapacity float64 `json:"minimumHealthCapacity"`
-	MaximumOverCapacity   float64 `json:"maximumOverCapacity"`
-}