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/nkj.json

@@ -4,6 +4,5 @@
     "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQChBWdyAG6uywiyNPjJzuoaf4/WfKb56c1uSbA2SggpWUdeblz78L8hWPiQ4Qd6ZyQmuKOqkWzY46wf80PrXK4393S0K7QGKuDL8Vd5dwmqqqtrEsz58JQMNRmJZ04Htw3cTQBXOjJMSuXdfBROKEY+hgqoJIHYtT/M+3OzLO6IJp6dIG5haDsjJ2hgZD91nXQrt5Vwvr3osaeiErQnkLPlOLmJSfQNFi1V0mZs4PTlaVXEHMssMxvH1upTYY5i9icBzejXHdhaWuHAZtIDXloaS6oEtH7Dcg3LYCnLuP12Ydfm3pKx+xonIYP2jiNgsQSpu/WLWlvKAwYMUMtTrC1f nkj@kosmos"
   ],
   "groups": ["sysadmin", "systemd-journal"],
-  "uid": 2005,
   "shell": "\/bin\/bash"
 }