Base64 encoded configuration does not represent current configuraiton

Image name: guacamole-rdp-vnc-gateway-existing-vnet

### Issue Details
The base64 encoded configuration in the following files does not represent the current config:

- https://github.com/Azure/azure-quickstart-templates/blob/master/guacamole-rdp-vnc-gateway-existing-vnet/azuredeploy.json
- https://github.com/Azure/azure-quickstart-templates/blob/master/guacamole-rdp-vnc-gateway-existing-vnet/scripts/cloud-config.yaml.b64

They contain different configuration than e.g. https://github.com/Azure/azure-quickstart-templates/blob/master/guacamole-rdp-vnc-gateway-existing-vnet/scripts/cloud-config.yaml where the `reboot-strategy` is set to `etcd-lock`. The base64 encoded versions still contain the deprecated value of `best-effort`.

This is related to this (incomplete) commit https://github.com/Azure/azure-quickstart-templates/commit/f5d778feda989597c987b05628311a622a00a047

Start by comparing scripts/cloud-config.yaml with scripts/cloud-config.yaml.b64 and the embedded configuration in azuredeploy.json, focusing on the reboot-strategy value. Verify that the encoded configuration matches the current plain YAML and that both referenced files consistently represent the same setting.

Written by the indexing model from the issue text.