Avoid warn with puppet4
Avoid warn with puppet4

"gnupg_installed" fact is not present by default, and we got this message in puppet4 server log :
WARN  [puppetserver] Puppet Unknown variable: '::gnupg_installed'. at 

An idea is to use the $facts['fact_name'] :
https://docs.puppet.com/puppet/4.10/lang_facts_and_builtin_vars.html#the-factsfactname-hash
maestrodev/puppet-rvm,squarit/puppet-rvm,maestrodev/puppet-rvm,squarit/puppet-rvm