router/a_no_egw.sh: remove obsolete script

router/a_no_egw.sh

-#!/bin/sh
-
-SETNAME=rkz
-
-arg=$1
-
-get_ipv4_list()
-{
-    echo "$1" | grep -q "[a-z]" || return 0
-    dig "$1" A | grep -v "^;" | grep "IN[[:space:]]*A[[:space:]]" | sed -e "s|.*[[:space:]]||"
-}
-
-for ip in $(get_ipv4_list $arg); do
-    echo "add $ip"
-    ipset del $SETNAME $ip
-    echo "$ip" >> a_no_egw.list
-done