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- implement ExternalID in Mesos cloud provider. This is used by the node
  controller to detect disappeared nodes.
- add test case for ExternalID

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beta.gcr.io is no longer needed to pull through v2.

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MESOS: increase dind loop device size to 10GB

This adds a very basic Zeppelin image that works with the existing
Spark example. As can be seen from the documentation, it has a couple
of warts:

* It requires kubectl port-forward (which is unstable across long
periods of time, at least for me, on this app, bug incoming). See

* I needed to roll my own container (none of the existing containers
exactly matched needs, or even built anymore against modern Zeppelin
master, and the rest of the example is Spark 1.5).

The image itself is *huge*. One of the further refinements we need to
look at is how to possibly strip the Maven build for this container
down to just the interpreters we care about, because the deps here
are frankly ridiculous.

This might be a case where, if possible, we might want to open an
upstream request to build things dynamically, then use something like
probably the cut the image down considerably. (This might already be
possible, need to poke at whether you can late-bind interpreters
later.)

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For the conformance tests 5 GB turned out to be not enough.

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Revert "use GroupVersion in APIGroupVersion for api installer"