Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1490305

Description of problem: We were trying to delete default admin user with another user having all permissions and was administrator. But while deleting default user, it shows error as " ERROR: update or delete on table "users" violates foreign key constraint "fk_rails_51975e21a8" on table "notification_recipients" DETAIL: Key (id)=(3) is still referenced from table "notification_recipients"."

How reproducible: always

Steps to Reproduce:
1. Login to satellite with default admin user
2. Create another user having all permissions and make administrator
3. Logout from admin
4. Login using another user created
5. Delete default admin user.

Actual results:
Not able to delete default admin user. It shows error as " ERROR: update or delete on table "users" violates foreign key constraint "fk_rails_51975e21a8" on table "notification_recipients" DETAIL: Key (id)=(3) is still referenced from table "notification_recipients"."

Additional info: Any User with administrator role can delete another user with administrator role but in case of deleting default admin it throws error.