Linting fixes

[mrwacky42]

• Ansible lint does not like comparing to booleans
• Do not set no_log in --check mode. If no_log is set in --check mode, then the play will fail with an error.
• Add newline to end of /etc/mailname

[mrwacky42]

Huh, I came to fix the E601 that ansible-lint threw at me, but it also lists a E602 - Do not compare to empty string.

• https://docs.ansible.com/ansible-lint/rules/default_rules.html

But that has issues:

• https://github.com/ansible/ansible-lint/issues/457

So...

[tersmitten]

Fixed in https://github.com/Oefenweb/ansible-postfix/commit/cd891eb1ef41d7255e37f8f26ffe27d10198aa96