Code review comment for lp:~mmoulton/cloud-init/chef

This branch now models Avishai's branch [1] for both initial_attributes and using json to write the file.

I also fixed a bug where the initial_properties would not be written if the run_list was not specified. This is important as you can push run lists to a node after the fact via the Chef server.

[1] http://bazaar.launchpad.net/~avishai-ish-shalom/cloud-init/chef/revision/400