Add no fetch option to provision

While hacking on my local kitchenplan configs, I realized that if I skip the librarian-update, provisioning would go much faster. 

I'm using this with `kitchenplan provision --recipes=provision::home --no-fetch` now, and development is going much faster now as I am locally developing my recipes.

I'm happier hacking with the --no-fetch option, but this may be a special case. Cheers