Set Chef::Config.file_backup_path to nil so the backup will file get …

…generated in the same directory as the existing one ( thus should already have write permissions )

chef/spec/unit/provider/template_spec.rb

@@ -21,6 +21,7 @@
 describe Chef::Provider::Template do
   before(:each) do
     Chef::Config.cookbook_path(File.expand_path(File.join(CHEF_SPEC_DATA, "cookbooks")))
+    Chef::Config.file_backup_path=nil
     Chef::Cookbook::FileVendor.on_create { |manifest| Chef::Cookbook::FileSystemFileVendor.new(manifest) }
 
     @node = Chef::Node.new