Get rid of scope.lookupvar

spec/classes/postfix_spec.rb

@@ -106,6 +106,8 @@ describe 'postfix' do
             /schleuder/
           ).with_content(
             /sympa/
+          ).with_content(
+            /user=bar/
           )
         }
         it { should contain_file('/etc/postfix/main.cf').without('seltype') }

templates/master.cf.debian.erb

@@ -68,7 +68,7 @@ scache	  unix	-	-	-	-	1	scache
 # Also specify in main.cf: maildrop_destination_recipient_limit=1
 #
 maildrop  unix  -       n       n       -       -       pipe
-  flags=DRhu user=<%= scope.lookupvar('postfix::mail_user') %> argv=/usr/bin/maildrop -d ${recipient}
+  flags=DRhu user=<%= @mail_user %> argv=/usr/bin/maildrop -d ${recipient}
 #
 # See the Postfix UUCP_README file for configuration details.
 #