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Improves version check by making following changes:
Look for version in Submariner.Status and ServiceDiscovery.Spec. These two are populated by submariner-oprator so are always present and accurate. This also fixes a bug in current code where if Submariner.Spec.Version is missing, it doesn't check for it in Status or ServiceDiscovery.
For subctl commands the major and minor versions are more important than patch versions. This is because changes that significantly affect subctl commands are mostly done in releases with subsequent releases being mostly bug fixes.