Merge pull request #768 from puppetlabs/CONT-775-Puppet_8_support

(CONT-775) Puppet 8 support

Author: jordanbreen28

.fixtures.yml

@@ -4,7 +4,7 @@ fixtures:
     provision: 'https://github.com/puppetlabs/provision.git'
     puppet_agent:
       repo: 'https://github.com/puppetlabs/puppetlabs-puppet_agent.git'
-      ref: v4.12.1
+      ref: v4.13.0
     stdlib: 'https://github.com/puppetlabs/puppetlabs-stdlib.git'
   symlinks:
     concat: '#{source_dir}'