Make compliant with ansible-lint - just case corrections and quoting …

[greigm]

…octal modes. Pretty trival for a pull-req, but lint errors mess with my brain!

[greigm]

I noticed AFTER I submitted the PR that the handler name was inconsistent and thus breaks - called from tasks/main.yml as "Restart postfix" but defined in the handler as "Restart service". I'm fairly new to this - is it best to submit another or can I simply point this to my branch head somehow? Sorry for the dumb questions.

EDIT: Oh, looks like github handles this for me... because of course it does! :)

[tersmitten]

I prefer to keep it as is