Add topologyspreadconstraint to deploy pods in sts cross different az evenly #526
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Fixes #521
Motivation
I see broker sts doesn't support topology constraint configuration. That means 2 pods in the sts may possible depoyed to on az in kubernetes cluster.
Reference doc: https://kubernetes.io/docs/concepts/scheduling-eviction/topology-spread-constraints/
Modifications
Added a topology spread constraint configuration to deployed the pods in sts spread to different az, so that under an AZ outage, the impact can be only limited to small number of brokers.
Verifying this change