As part of #130, we need to provide a clean way for users to upgrade their Istio version.

Upgrading Istio will require:

1. Updating the Istio Control Plane:
   • The version is controlled by these deployKF values (or the user's existing install):
     • deploykf_dependencies.istio.charts.istioBase.version
     • deploykf_dependencies.istio.charts.istioDaemon.version
2. Updating the Istio Gateway Deployments:
   • The version is controlled by these deployKF values (or the user's existing install):
     • deploykf_core.deploykf_istio_gateway.charts.istioGateway.version
3. Restarting all Pods with Istio sidecars

Step 3 will require a new script, the script will have to do the following:

1. Determine the current istio version
2. Find Pods which have "out of date" sidecars
3. Issue kubectl rollout restart ... to the owner of the Pod