[chef] Cookbooks upgrade to Chef 12

[sd < >]

Hi,

I would like to upgrade to Chef12, server and nodes but currently I have a large number

of cookbooks that don't have 

-  The `name' attribute is required in cookbook metadata - as per https://docs.chef.io/config_rb_metadata.html this is required now

- the hash syntax has changed since the ruby version has changed as well

- there are as well some string quotes that act different into the new version

What is the best migration path ?

thanks!