[chef] Managing client and user pems

["tayworm ." < >]

Before Chef 12 (when I was running OS Chef 11), I had only an admin client.pem that I used with knife and berkshelf to managing cookbooks/nodes/etc. Now with Chef 12 I needed to create a user.pem to upload cookbooks and such.

What is the recommended way to manage these keys? Do I not need a client.pem for my workstation anymore? Is there any way to specify the private key from my old client as the private key to use for my new user?