Stop stringifying Puppet facts

That’s one of the steps of the migration to Puppet 4: https://docs.puppet.com/puppet/4.5/reference/upgrade_major_pre.html#stop-stringifying-facts-and-check-for-breakage

Parent Task: #11834 (closed)

Related issues

• Blocks #11837 (closed)
• Blocked by #11835 (closed)
• Blocks #13284
• Blocks #11833 (closed)

Original created by @intrigeri on 11836 (Redmine)