smtpd: Simplify config, use single config file

smtpd/templates/client.conf.erb

@@ -1,3 +1,11 @@
+<% if @operatingsystem == "OpenBSD" -%>
+listen on lo0
+<% else -%>
+listen on localhost
+<% end -%>
+
+table aliases db:<%= @aliases %>.db
+
 <% if @relay -%>
 accept from local for any relay via <%= @relay %><% if @mail_domain %> as "@<%= @mail_domain %>"<% end %>
 <% else -%>

smtpd/templates/server.conf.erb

@@ -1,6 +1,8 @@
+listen on lo0
 listen on egress port smtp tls certificate server
 listen on egress port submission tls-require certificate server auth
 
+table aliases db:/etc/mail/aliases.db
 table clients db:/etc/mail/clients.db
 <% @domains.each do |domain| -%>
 table aliases.<%= domain %> db:/etc/mail/aliases.<%= domain %>.db