jormungandr: rename script in scenario
Jormungandr: small refacto for the default scenario

Externalization of helpers function like the pagination
Jormungandr: split the default scenario in two

The "simple" for all api except journeys, it is not mean to be use but
to be inherited for implementing the desired logic for journeys without
having to redifine all basic methods
Jormungandr: deletion of a old and useless cmake file