fix simple linting errors
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.
use a .puppet-lint.rc for usage outside of rake tasks
Merge pull request #614 from justinstoller/lint_fixes

Lint fixes