nginx: Fix user on Ubuntu

abusesa/manifests/services.pp

@@ -19,10 +19,12 @@ class abusesa::services(
     ],
   }
 
+  include nginx
+
   exec { 'usermod-nginx-abuserv':
     path    => '/bin:/usr/bin:/sbin:/usr/sbin',
-    command => 'usermod -a -G abuserv nginx',
-    unless  => 'id -n -G nginx | grep \'\babuserv\b\'',
+    command => "usermod -a -G abuserv ${nginx::user}",
+    unless  => "id -n -G ${nginx::user} | grep '\\babuserv\\b'",
     require => [
       Class['nginx'],
       Group['abuserv'],
@@ -47,7 +49,6 @@ class abusesa::services(
     content => "umask 007\n",
   }
 
-  include nginx
   nginx::config { 'abusesa.conf':
     content => template('abusesa/services/nginx.conf.erb'),
   }