ActiveActive mode ingress does not support istio

[walkafwalka]

Configuration:

activeActive:
  method: istio
  apiIngressUrl: api.foobar.com
  dbIngressSuffix: -db-api.foobar.com

Error:

RedisEnterpriseCluster.app.redislabs.com "redis-enterprise" is invalid: spec.activeActive.method: Unsupported value: "istio": supported values: "openShiftRoute", "ingress"

I also tried modifying the CRD to allow istio as a config option, but the actual operator still does not like it.

[walkafwalka]

@yuvallevy2