Error on jinja render for matched documents created by python-logstash-async

[drakaru]

We use python-logstash-async in our python services, which adds a 'type' field to the document
https://github.com/eht16/python-logstash-async/blob/master/logstash_async/formatter.py#L104

Since #282 both the match and the rule are expanded into the same function call.
They clash since they both have a field called type

TypeError: render() got multiple values for keyword argument 'type'

[mrfroggg]

If I check on how it works with alert_text_args works in BasicMatchString, it prioritizes the content of the match before the content of the rule.
We'll have to do something similar for alert_text_jinja.

[mrfroggg]

Fixed in #311