CS-15942: Failed to apply Port Forwarding rule to Redundant router

Previously failed due to error in iptables command to use a list of IPs.
Fixed by using only its first assigned IP and subnet for guest IP network.

Reviewed-by: Jayapal Uradi and Abhinandan Prateek.

Signed-off-by: Rohit Yadav <rohit.yadav@citrix.com>
Signed-off-by: Abhinandan Prateek <aprateek@apache.org>

patches/systemvm/debian/config/root/firewall.sh

@@ -48,7 +48,7 @@ ip_to_dev() {
 }
 
 doHairpinNat () {
-  local vrGuestIPNetwork=$(sudo ip addr show dev eth0 | grep inet | grep eth0 | awk '{print $2}' )
+  local vrGuestIPNetwork=$(sudo ip addr show dev eth0 | grep inet | grep eth0 | awk '{print $2}' | head -1)
   local vrGuestIP=$(echo $vrGuestIPNetwork | awk -F'/' '{print $1}')
 
   local publicIp=$1