Create script to block a user's crontab

According to https://superuser.com/questions/380145/disable-cron-jobs-for-a-specific-user, we can rename an user's crontab file to disable it.

We need to verify where the crontabs file located on login004 and login005. Because I found /var/spool/cron/louistw on CoD head node but in the post it show /var/spool/cron/crontabs/user2.

Update: On login005, we verified path is /var/spool/cron/louistw for user louistw.