templates the external address to ping

Former-commit-id: 7ceade21

roles/nhc/templates/check_nat.nhc.j2

+#!/bin/bash
+
+#checks that NAT is working by pinging an external address from a compute node
+
+function check_nat() {
+#echo ">>> Checking NAT on Compute Nodes Works >>>>>>>>>>>>>>>>>>>>>>>>>"
+
+
+#test NAT by pinging an external IP ADDRESS
+PING_EXTERNAL="ping -c 2 {{ EXTERNAL_IP_ADDRESS }}"
+ 
+$PING_EXTERNAL
+RESULT=$?
+if [ $RESULT -ne 0 ]; then
+     die 1 " $FUNCNAME ERROR on node. Can not ping external address. Command is ' ${PING_EXTERNAL} ' Please check NAT is working, or route on node is valid"
+     return 1
+fi
+return 0
+}
+
+