Add glide.yaml and vendor deps

vendor/k8s.io/kubernetes/docs/design/clustering/README.md

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+This directory contains diagrams for the clustering design doc.
+
+This depends on the `seqdiag` [utility](http://blockdiag.com/en/seqdiag/index.html).
+Assuming you have a non-borked python install, this should be installable with:
+
+```sh
+pip install seqdiag
+```
+
+Just call `make` to regenerate the diagrams.
+
+## Building with Docker
+
+If you are on a Mac or your pip install is messed up, you can easily build with
+docker:
+
+```sh
+make docker
+```
+
+The first run will be slow but things should be fast after that.
+
+To clean up the docker containers that are created (and other cruft that is left
+around) you can run `make docker-clean`.
+
+## Automatically rebuild on file changes
+
+If you have the fswatch utility installed, you can have it monitor the file
+system and automatically rebuild when files have changed. Just do a
+`make watch`.
+
+
+<!-- BEGIN MUNGE: GENERATED_ANALYTICS -->
+[![Analytics](https://kubernetes-site.appspot.com/UA-36037335-10/GitHub/docs/design/clustering/README.md?pixel)]()
+<!-- END MUNGE: GENERATED_ANALYTICS -->