Double Quotes in configuration properties can lead to JSON templating failing

[UnseenWizzard]

As quotes are currently not escaped before placing config properties from a yaml into a json,
it is possible to define configuration properties in a config yaml that lead to invalid JSONs on templating.

Specifically this happens as YAML allows:

- key: This is a perfectly fine "string value"

Which on templating a json of the form:

{
  "value" : " {{ .key }}"
}

Results in the invalid output:

{
  "value" : "This is a perfectly fine "string value""
}

Which should instead be:

{
  "value" : "This is a perfectly fine \"string value\""
}