Write basic etcd-operator logic

We agreed on the folowing logic:

Create configmap with env ETCD_INITIAL_CLUSTER_STATE=new
Create StatefulSet with needed amount of replicas and envFrom: <configmap>, and podManagementPolicy: Parallel
Wait unitl all replicas become ready
Update configmap to ETCD_INITIAL_CLUSTER_STATE=existing
Consider that cluster as bootstrapped

currently locked by #9

Don't forget about persistence:

spec:
  persistentVolumeClaimRetentionPolicy:
    whenDeleted: Retain
    whenScaled: Retain
  podManagementPolicy: Parallel

podManagementPolicy: Parallel

I think this policy should not be controlled by user, as it is part of operator logic

  persistentVolumeClaimRetentionPolicy:
    whenDeleted: Retain
    whenScaled: Retain

Do you have any examples how are other operator define this spec?
Let's discuss it at the next community meeting.

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