Adds tmpreaper to jenkins slave crontab.

Schedules tmpreaper to run daily at 1am, and delete files older than 1 days from /tmp.
Fixes bug 925774

Change-Id: Iff9383d020fa3ea0cbbe85d4ea0e5fe27ba6901e

modules/jenkins_slave/manifests/init.pp

@@ -65,6 +65,7 @@ class jenkins_slave {
                  "socat",
                  "sqlite3",
                  "swig",
+                 "tmpreaper",
                  "unzip",
                  "vlan",
                  "wget"]
@@ -103,4 +104,12 @@ class jenkins_slave {
        ],
     }
 
+    cron { "tmpreaper":
+      user => jenkins,
+      minute => '0',
+      hour   => '1',
+      command => '/usr/sbin/tmpreaper --runtime 1200 --delay 600 1d /tmp',
+      require => [ Package[tmpreaper], Jenkinsuser[jenkins] ],
+   }
+
 }