Check that username is not in the banned list

makeuser_no_ansible

@@ -22,6 +22,7 @@ case $1 in
     usage; error_exit "unknown option $1" ;;
   *)
     [[ $# -ne 3 ]] && error_exit "not enough args"
+    $(sudo grep -qiw $1 $BANNED) && error_exit "$1 is on the ban list!"
 
 	#adding new user
 	makeuser_no_ansible $1 $2