[REF] Dependency cloning more extensible

[dreispt]

This is a preparatory work, to next add a "satellite repo integration" feature.
The run() function both cloned dependency repos, and pip installed the Python requirements.txt.
Here we split these two jobs into their own functions: clone_repos() and install_requirements().

[moylop260]

👍

[pedrobaeza]

Is this still relevant? If so, you need to rebase.

[dreispt]

@pedrobaeza Yes it still is, but I'm following the pip-installation work to see how it matches with this.

[nhomar]

@dreispt Is this valid yet? can you rebase if Yes,, you had the +1 from @moylop260 but it is not mergeabel