Ansible: Validate sudoers before copying

[mhaamann]

To ensure that you do not break your sudoers configuration the file is validated as a safety precaution.

(I managed to brick my server since i forgot a line break when copying sudoers_zabbix_smartctl to my ansible scripts) Source: https://docs.ansible.com/ansible/latest/modules/copy_module.html

[v-zhuravlev]

Thanks for contributing!