Request: a new gxadmin command that can disable/delete a user account

[sanjaysrikakulam]

A handy gxadmin command to disable/delete a user account.

1. Accepts a domain (e.g., @XXXX.YYY) name and deletes all domain users.
2. Accepts a user id and deletes that specific user.
3. Accepts an email and delete that specific user.