This commit plumbs contexts which are needed for the new client.

HollowNode refactoring

Enabled InitialResources e2e in autoscaling suite

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Make Kubemark master components write logs to the /var/logs

Added horizontal pod autoscaler example.

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This avoid that we either waste cpu resources due to rounding or that we report
to much to the kubelet such that the e2e tests think they can schedule more than
resources are available.

This fixes https://github.com/mesosphere/kubernetes-mesos/issues/437

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- simplify
- rename kubeletExecutor -> executorKubelet
- move executorKubelet code into kubelet.go
- remove duplicated executorKubelet.ListenAndServe
- fix executorKubelet.Run comment

This patch reduces the dependencies of the executor from the kubelet. This
makes it possible launch the kubelet after the executor.

This considerably reduces the complexity of the startup code.

Moreover, this work is a requirement to use a standalone kubelet some day.