Issue 1503 - Remove hard-coded $MAILTO variable from stats cron environment

modules/statsmaster/manifests/downloads.pp

 class statsmaster::downloads {
   package {['pypy', 'python-jinja2']:}
 
   class {'sitescripts':
     sitescriptsini_content => template('statsmaster/sitescripts.ini.erb'),
   }
 
   file {['/var/www/stats', '/var/www/statsdata']:
     ensure => directory,
     mode => 0755,
     owner => stats,
   }
 
   file {'/var/www/statsdata/usercounts.html':
     ensure => file,
     mode => 0444,
     source => 'puppet:///modules/statsmaster/usercounts.html',
     owner => stats,
   }
 
   cron {'updatestats':
     ensure => present,
     require => [
                  Package['pypy'],
                  Package['python-jinja2'],
                  Class["sitescripts"]
                ],
     command => "pypy -m sitescripts.stats.bin.logprocessor && python -m sitescripts.stats.bin.pagegenerator",
-    environment => ['MAILTO=admins@adblockplus.org,root',
-      'PYTHONPATH=/opt/sitescripts'],
+    environment => concat(hiera('cron::environment', []), [
+      'PYTHONPATH=/opt/sitescripts',
+    ]),
     user => stats,
     hour => 1,
     minute => 30,
   }
 }