Refactor Kubelet's server functionality into a server package. Most
notably, move pkg/kubelet/server.go into
pkg/kubelet/server/server.go. This will lead to better separation of
concerns and a more readable code hierarchy.

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Roles support in Kubernetes-Mesos was done using pod labels. This
commits moves this to pod annotations. Pod label yaml files don't
support '*' characters, furthermore roles are consumed by the scheduler
only and are not meant for querying/filtering.

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Update etcd godep to fix golang 1.5.1 data race

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Allow creation of clusters larger than 500 nodes in GCE, take 2.

Autoscaling e2e tests: bumped resource consumer to version beta2.

Relax scalability limits

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