Stop managing puppet apt pins

We're going to upgrade puppet2 to puppet3 on each host individually.
Stop managing the apt pins during the transition so that sysadmins
can edit the files directly.

Change-Id: Ia7f3cdc33a4451652387dbd051f4429af8d6f434

modules/openstack_project/manifests/base.pp

@@ -132,15 +132,6 @@ class openstack_project::base(
       replace => true,
     }
 
-    file { '/etc/apt/preferences.d/00-puppet.pref':
-      ensure  => present,
-      owner   => 'root',
-      group   => 'root',
-      mode    => '0444',
-      content => template('openstack_project/00-puppet.pref.erb'),
-      replace => true,
-    }
-
     file { '/etc/default/puppet':
       ensure  => present,
       owner   => 'root',