Manually create telegraf.conf ConfigMap when using helm-charts

[jminardi]

I am experiencing an issue with the auto generation of the telegraf.conf ConfigMap when converting from the json file in the values.yaml. See Issue #682

Is it possibly to configure the helm charts not to create this ConfigMap, and instead let me manually create it and populate it with my own telegraf.conf toml file? That would let me sidestep the issue of json -> toml errors.