Work better with scripts, e.g. ansible

[johanfforsberg]

Today in ansible we use dsconfig as a python module in order to detect changes properly. But then we get problems with python2/3.

See if we can make the "json2tango" script more suitable for running directly by ansible and still be able to detect if anything was changed. That way we don't have to care what python version is involved. I think return codes don't really work for this as they should be about errors... there must be some similar cases where people have wrapped programs in ansible modules to make them idempotent?