Merge pull request #435 from puppetlabs/pdksync_(MAINT)_Pin_puppetlabs-puppet_agent

pdksync - (CONT-768) Pin puppetlabs-puppet_agent

Author: jordanbreen28

.fixtures.yml

@@ -7,7 +7,9 @@ fixtures:
       repo: 'https://github.com/puppetlabs/puppetlabs-stdlib.git'
       ref: '5.0.0'
     facts: 'https://github.com/puppetlabs/puppetlabs-facts.git'
-    puppet_agent: 'https://github.com/puppetlabs/puppetlabs-puppet_agent.git'
+    puppet_agent:
+      repo: 'https://github.com/puppetlabs/puppetlabs-puppet_agent.git'
+      ref: v4.12.1
     provision: 'https://github.com/puppetlabs/provision.git'
   symlinks:
     accounts: "#{source_dir}"