Issue 2982 - Don't send notifications to users that were in the browser notification test

modules/notificationserver/manifests/init.pp

 class notificationserver($is_default = false) {
   if !defined(Class['nginx']) {
     class {'nginx':
       worker_connections => 4000,
       ssl_session_cache => off,
     }
   }
 
   class {'sitescripts':
     sitescriptsini_source => 'puppet:///modules/notificationserver/sitescripts.ini'
@@ skipping 10 matching lines @@
   }
 
   cron {'update_notifications':
     command => 'hg pull -q -u -R /opt/notifications',
     environment => ['MAILTO=admins@adblockplus.org,root'],
     minute => '*/5',
     user => 'nginx',
     require => Exec['fetch_notifications'],
   }
 
+  cron {'generate_empty_notification_json':
+    command => 'echo "{\"notifications\": [], \"version\": \"`date +\%Y\%m\%d\%H\%M`\"}" > /var/www/empty-notification.json',
+    environment => ['MAILTO=admins@adblockplus.org,root'],
+    minute => '*',
+    user => 'nginx',
+  }
+
   include spawn-fcgi
   package {'python-flup':}
 
   spawn-fcgi::pool {'multiplexer':
     ensure => present,
     fcgi_app => '/opt/sitescripts/multiplexer.fcgi',
     socket => '/tmp/multiplexer-fastcgi.sock',
     mode => '0666',
     user => 'nginx',
     children => 1,
@@ skipping 13 matching lines @@
   nginx::hostconfig{'notification.adblockplus.org':
     source => 'puppet:///modules/notificationserver/site.conf',
     global_config => template('notificationserver/global.conf.erb'),
     is_default => $is_default,
     certificate => 'easylist-downloads.adblockplus.org_sslcert.pem',
     private_key => 'easylist-downloads.adblockplus.org_sslcert.key',
     log => 'access_log_notification',
     log_format => 'notification',
   }
 }