Creating /etc/cassandra/conf directory before yaml file gets copied into it. In case it is not created, script execution will fail.

Below script fails in case if _conf_dir_ is not created before it gets executed.
```ruby
%w(cassandra.yaml cassandra-env.sh).each do |f|
  template File.join(node.cassandra.conf_dir, f) do
     cookbook node.cassandra.templates_cookbook
     source "#{f}.erb"
     owner node.cassandra.user
     group node.cassandra.group
     mode  "0644"
     notifies :restart, "service[cassandra]", :delayed if node.cassandra.notify_restart
   end
 end
```