Random stab at fixing breakage in 49f9f658

49f9f658 breaks puppet on prod caches with:
Feb 25 22:33:45 cp4012 puppet-agent[3962]: Could not retrieve catalog from remote server: Error 400 on SERVER: keys(): Requires hash to work with at /etc/puppet/manifests/role/analytics/kafka.pp:84 on node cp4012.ulsfo.wmnet

Change-Id: I876019bb1b6169aee6fb176a86e015c334e6c430