Remove the sudo cookbook

Chef 14 ships with a sudo resource:
https://docs.chef.io/resource_sudo.html

cookbooks/sudo/files/README

@@ -1,6 +0,0 @@
-# This will cause sudo to read and parse any files in the /etc/sudoers.d
-# directory that do not end in '~' or contain a '.' character.
-#
-# Note that there must be at least one file in the sudoers.d directory (this
-# one will do), and all files in this directory should be mode 0440.
-#