Rename Cook command's `--skip-chef-check` option to `--no-chef-check`

Knife convention is to use "--no-option" or "--[no-]option". In that case the "Mixlib::CLI" class allows the option with or without the "no". And this gives also the opportunity to set the default on knife configuration and the override it on command line.

The old "skip" option should be left for some period of time to maintain backwards compatibility.

Does anyone disagree?