Remove UID from all users

We don't need preconfigure it. This way it won't change the UID of
existing accounts, having to recreate them in the process.

data_bags/users/basti.json

@@ -4,6 +4,5 @@
     "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDDyUDR7ZE6HWmjvlfKrG8Ci+q5E4adbyboKvyYVkUXaTYt+DgisPPAqfGkd0yAHgVnmOS/3f5c3D6RrIXcxFmzwpV2BtmGZztBnEYvC5q8XPQhmu6AFl6ZDjh9XzUeO52py8tt5ZJ9W1R2ob/rlgX8txNHi6XwzuvPxZ7NR/iNup7cruBzkHABhwTvTfwaErufr6eNmNjh5VatNTei1ld6yWtmvbYJqJlpq6YyPu9vYNYPg0AB7I+OqOJhzHXhelY28GSP9KF3GDcHDtN1bV21g9+COcdKhMShQaw1WIkfQKdiuFictZIOCP0/uYSiFhyyoSvISiC3eT8zIimRbDRj basti@skddc.local"
   ],
   "groups": ["sysadmin", "systemd-journal"],
-  "uid": 2002,
   "shell": "\/bin\/bash"
 }