[COOK-3124] : add memcached_template attribute to memcached provider

Author: Warren Bain

providers/memcached.rb

@@ -34,8 +34,8 @@
   Chef::Log.warn("No node with role #{new_resource.role}") unless results.any?
 
   template "#{new_resource.application.path}/shared/memcached.yml" do
-    source "memcached.yml.erb"
-    cookbook "application_ruby"
+    source new_resource.memcached_template || "memcached.yml.erb"
+    cookbook new_resource.memcached_template ? new_resource.cookbook_name.to_s : "application_ruby"
     owner new_resource.owner
     group new_resource.group
     mode "644"

resources/memcached.rb

@@ -20,6 +20,8 @@
 include ApplicationCookbook::ResourceBase
 
 attribute :role, :kind_of => [String, NilClass], :default => nil
+# Actually defaults to "memcached.yml.erb", but nil means it wasn't set by the user
+attribute :memcached_template, :kind_of => [String, NilClass], :default => nil
 
 def options(*args, &block)
   @options ||= Mash.new