[k8s]Deploy etcd cluster independently out of master nodes

Registered by Wang Bo on 2017-10-09

Currently, etcd cluster are deployed on master nodes with k8s control plane. To improve etcd cluster availability and stability, It's better to reserve enough CPU/Memory resources for etcd.
So deploy the etcd cluster, master nodes, slave nodes separately nodes to avoid resources preemption with k8s control plane.

Or we could also start up etcd as container to request and limit etcd's resources.

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Drafter:
Wang Bo
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Wang Bo
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