disable lint check for "single quoted variables"
disable lint check for "single quoted variables"

Previously we were checking (and failing every linting run) because
the values for Debian configurations uses a syntax that looks like
Puppet variables.  This is regrettable since it's a valuable check but
the fix will probably require changing how the conf variables are
handled which is out of the scope of this PR.

dzmitryv/puppetlabs-apache,gerhardsam/puppetlabs-apache,buzzdeee/puppetlabs-apache,buzzdeee/puppetlabs-apache,puppetlabs/puppetlabs-apache,eputnam/puppetlabs-apache,digitalmediacenter/puppetlabs-apache,guegue/puppetlabs-apache,FlatKey/puppetlabs-apache,traylenator/puppetlabs-apache,dzmitryv/puppetlabs-apache,bmjen/puppetlabs-apache,bmjen/puppetlabs-apache,svanhart/puppetlabs-apache,svanhart/puppetlabs-apache,puppetlabs/puppetlabs-apache,eputnam/puppetlabs-apache,guegue/puppetlabs-apache,samuelb/puppetlabs-apache,yakatz/puppetlabs-apache,samuelb/puppetlabs-apache,digitalmediacenter/puppetlabs-apache,traylenator/puppetlabs-apache,gerhardsam/puppetlabs-apache,FlatKey/puppetlabs-apache,yakatz/puppetlabs-apache