Rubocop fix: Style/PredicateName
Rubocop fix: Style/PredicateName

`is_to_s` is part of the Puppet API.

This is not a 'boolean method' as described here.
https://github.com/rubocop-hq/ruby-style-guide#bool-methods-prefix

`is` and `should` values are a puppet resource property concept.

crayfishx/puppet-firewalld,crayfishx/puppet-firewalld