[stable/etcd-operator] Outdated cluster template

[arthur0]

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BUG REPORT:

Which chart:
etcd-operator

What happened:
In the current template, the etcd-cluster TPR is defined by

apiVersion: "etcd.coreos.com/v1beta1"
kind: "Cluster"

Reference: Cluster template

What you expected to happen:
Update it to the current etcd-cluster TPR to

apiVersion: "etcd.database.coreos.com/v1beta2"
kind: "EtcdCluster"

Reference: etcd-operator docs