Relicense under GPLv3 and clean up modules (#57)

Clean up modules according to last Ansible changes
Set license for GPLv3 to avoid various possible issues

.github/workflows/collection-continuous-integration.yml

@@ -89,7 +89,10 @@ jobs:
           ~/.local/bin/ansible-galaxy collection install .cache/collection-tarballs/*.tar.gz
       - name: Run collection sanity tests
         run: >-
-          ~/.local/bin/ansible-test sanity --color --requirements --python "${{ matrix.python-version }}" -vvv
+          ~/.local/bin/ansible-test sanity
+          --color
+          --requirements
+          --python "${{ matrix.python-version }}" -vvv
           plugins/ tests/
         working-directory: >-
           /home/runner/.ansible/collections/ansible_collections/containers/podman