argo-rollouts: After abort, rollout does not update Istio DestinationRule

Summary

What happened/what you expected to happen?

When we abort the rollout then it should update the Istio destination rule so in destinationrule we have subsets with correct rollouts-pod-template-hash label.

But currently when we abort the rollout it does not update the destination rule, causing cannery endpoint to fail.

Diagnostics

What version of Argo Rollouts are you running? 0.3.0

# Paste the logs from the rollout controller
canary subset is not updated with correct rollouts-pod-template-hash label value.

# Logs for the entire controller:
kubectl logs -n argo-rollouts deployment/argo-rollouts

# Logs for a specific rollout:
kubectl logs -n argo-rollouts deployment/argo-rollouts | grep rollout=<ROLLOUTNAME>
logs does not have any reference for destinationrule update after abort action

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