Build something generic to expose python code to the cli

[JeffreyDevloo]

Problem description

All cli calls have to manually added to a bash file and it is becoming a bit dirty. There should be something more generic to use to make our life a bit easier.

(potential inspiration: https://github.com/openvstorage/openvstorage-health-check/blob/master/ovs/extensions/healthcheck/expose_to_cli.py#L57 + https://github.com/openvstorage/openvstorage-health-check/blob/master/ovs/extensions/healthcheck/expose_to_cli.py#L44)