Turns out we _do_ need puppet installed.

Change-Id: I3c8ca151f48b94a86646dbcc8dbd2d950c4e22b9

modules/jenkins_slave/manifests/init.pp

@@ -60,6 +60,10 @@ class jenkins_slave {
         ensure => latest
           }
     
+    package { "puppet":
+        ensure => latest
+          }
+    
     package { "bzr":
         ensure => latest
           }