Add a resource_name to ulimit_domain

This keeps it from breaking in Chef 16
Signed-off-by: Tim Smith <tsmith@chef.io>

libraries/domain.rb

@@ -3,6 +3,8 @@ require 'chef/resource'
 class Chef
   class Resource
     class UlimitDomain < Chef::Resource
+      resource_name :ulimit_domain
+
       property :domain, String
       property :domain_name, String, name_property: true
       property :filename, String