* Change to FQCN with ansible-lint fixer
Since ansible-base 2.10 (later ansible-core), FQCN is the new way to go.
Updated .ansible-lint with a production profile and removed fqcn in skip_list.
Updated .yamllint with rules needed.
Ran ansible-lint --fix=all, then manually applied some minor changes.
* Changed octal value in molecule/ipv6/prepare.yml
* Molecule: Derive overrides.yml location from scenario dir
# Conflicts:
# molecule/default/molecule.yml
# molecule/ipv6/molecule.yml
* Molecule: Add single_node scenario
* Fix get_nodes test for the case of empty groups