odoo-instace: create json configuration file from oca_dependencies file from main project and the ones in the dependencies repos

[zaoral]

Currently we are updating manually the json file. But will be good that after update the main project oca_dependencies will automatic refresh this file.

Maybe, generate this file inside the container is better solution, this way we can use odoo-instance for whatever project we want.

When creating the json configuration file we need to also take into account the oca_dependencies files inside the dependencies repositories: this is required to ensure the complete update and function of the new databases generate via odoo-instance

# let us generate json with the current dependencies
$ pip install branchesv
# let us extract data from all the requirements.txt
$ pip reqgen