[COOK-1790] - move aliases template to default

templates/default/aliases.erb

@@ -0,0 +1,11 @@
+#
+# This file is generated by Chef for <%= node['fqdn'] %>
+#
+# Local changes will be overwritten
+#
+# See man 5 aliases for format
+postmaster:    root
+
+<% node['postfix']['aliases'].each do |name, value| %>
+<%= name %>:  "<%= value %>"
+<% end unless node['postfix']['aliases'].nil? %>