[2.0.1] Fix variable behavior issue
- Add comments in defaults/main.yml
- Create new variables in format '_for_all', '_for_group', '_for_host' to make the configuration more flexible. This new behavior is closer to how ansible works with host_vars and group_vars. In addition, this modification corrects a problem that prevented the modification of a single element of a 'map' variable.
- Update molecule tests
- Update variable to apply the same syntax everywhere