Bug 1144804 - Vagrant: Remove workaround for older versions of puppet

This removes the puppet workaround added by bug 1144805, since the
Ubuntu 14.04 vagrant image comes with puppet 3.4.3, and so includes the
fix for:
https://projects.puppetlabs.com/issues/10907

puppet/manifests/vagrant.pp

@@ -28,11 +28,8 @@ $RABBITMQ_USER = 'guest'
 $RABBITMQ_PASSWORD = 'guest'
 $RABBITMQ_VHOST = '/'
 
-# We need to force output on_failure, since we're using Puppet 2.x which
-# does not have the fix for https://projects.puppetlabs.com/issues/10907
 Exec {
     path => "/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin",
-    logoutput => on_failure,
 }
 
 line {"etc-hosts":