ffmuc-mesh-vpn-wireguard: fix for older nslookup

Older versions of nslookup use a different format

ffmuc-mesh-vpn-wireguard-vxlan/files/lib/gluon/gluon-mesh-wireguard-vxlan/checkuplink

@@ -222,7 +222,8 @@ NTP_SERVERS_ADDRS=""
 
 set -o pipefail # Enable pipefail: this script does not fully support pipefail yet, but required below
 for NTP_SERVER in $NTP_SERVERS; do
-	all_ntp_ips="$(gluon-wan nslookup "$NTP_SERVER" | grep '^Address:\? ' | sed 's/^Address:\? //')"
+	# older versions of nslookup use "Address 1:" with increasing numbers, newer just use "Address:"
+	all_ntp_ips="$(gluon-wan nslookup "$NTP_SERVER" | grep '^Address \?[0-9]*:\? ' | sed 's/^Address \?[0-9]*:\? //')"
 	if ip -6 route show table 1 | grep -q 'default via'
 	then
 		# We need to match a few special cases for IPv6 here: