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/cloudfoundry-incubator/candiedyaml/LICENSE

@@ -174,3 +174,28 @@
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integration/vendor/github.com/cloudfoundry-incubator/candiedyaml/NOTICE

@@ -0,0 +1,18 @@
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