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Deprecate old LB options, fix endpoint sync. (#287)

* Depreate old LB options, fix endpoint sync.

- deprecate useLoadBalancer, replicaLoadBalancer from the manifest
  and enable_load_balancer from the operator configuration. The old
  operator configuration options become no-op with this commit. For
  the old manifest options, `useLoadBalancer` and `replicaLoadBalancer`
  are still consulted,  but only in the absense of the new ones
  (enableMasterLoadBalancer and enableReplicaLoadBalancer).

- Make sure the endpoint being created during the sync receives proper
  addresses subset. This is more critical for the replicas, as for the
  masters Patroni will normally re-create the endpoint before the
  operator.

- Avoid creating the replica endpoint, since it will be created automatically
  by the corresponding service.
- Update the README and unit tests.

Code review by @mgomezch and @zerg-junior

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