Refactor the ansible roles

[kpouget]

We are currently using some roles (eg nv_gpu) to perform many different tasks, depending on the flags we activate:

  - name: Install NFD-operator from OperatorHub
    include_tasks: roles/nv_gpu/tasks/install_nfd.yml
    when: install_nfd_operator_from_hub == "yes"

  - name: Wait for NFD-labeled GPU nodes to appear
    include_tasks: roles/nv_gpu/tasks/test_nfd_gpu.yml
    when: nfd_test_gpu_nodes == "yes"

  - name: Install GPU-operator from OperatorHub
    include_tasks: roles/nv_gpu/tasks/install_nv.yml
    when: install_gpu_operator_from_hub == "yes"

I don't think this is the way ansible roles are supposed to be used, as it causes many tasks to be shown as "skipped", but still visible in the logs.

This ticket will track the refactoring of these big roles into smaller chunks, doing only one task (=one role per toolbox script, more or less).

[kpouget]

My main interrogation is related to the variables that we define for each role, and how they will be distributed into the smaller roles, eg when using the same files (with a constant defining its path) between the install and uninstall meta-tasks ...

[kpouget]

will be fixed by #100 #98 #97 #96

[kpouget]

Closing as #100 #98 #97 #96 are merged.