Change acknowledge order based on prod/test

Resolves #2 (closed)

Introduces new is_production parameter to config.ini files in [service] section.

Defaults to true if not set. Example:

[service]
tool = filter_test

root = /samba/requests/
rabbit_host = ...
rabbit_user = ...
rabbit_password = ...
queue_prefix = nlp_
is_production = false