Update IKEv2 setup log

- When using the IKEv2 change server address script on Docker,
  update the IKEv2 setup log with the new server address, so that
  it can be displayed in the container logs after a restart.

extras/ikev2changeaddr.sh

@@ -248,6 +248,13 @@ update_ikev2_conf() {
   sed -i "/conn ikev2-cp/a \  leftcert=$server_addr" /etc/ipsec.d/ikev2.conf
 }
 
+update_ikev2_log() {
+  ikev2_log="/etc/ipsec.d/ikev2setup.log"
+  if [ -s "$ikev2_log" ]; then
+    sed -i "/VPN server address:/s/$server_addr_old/$server_addr/" "$ikev2_log"
+  fi
+}
+
 restart_ipsec_service() {
   bigecho "Restarting IPsec service..."
   mkdir -p /run/pluto
@@ -278,6 +285,7 @@ ikev2changeaddr() {
 
   create_server_cert
   update_ikev2_conf
+  update_ikev2_log
   if [ "$os_type" = "alpine" ]; then
     ipsec auto --replace ikev2-cp >/dev/null
   else