Fix iptables POSTROUTING chain syntax

Related-Prod: PRODX-58733
Change-Id: I55a9c18f40cb9b0e93f2079d13f29a40274b4e02
diff --git a/de/heat-templates/scripts/functions.sh b/de/heat-templates/scripts/functions.sh
index fc1b4c2..f349503 100644
--- a/de/heat-templates/scripts/functions.sh
+++ b/de/heat-templates/scripts/functions.sh
@@ -636,7 +636,7 @@
 #Allow access to Internet from VMs for virtualized environment.
 cat << EOF >> /etc/iptables/rules.v4
 *nat
-:POSTROUTING ACCEPT - [0:0]
+:POSTROUTING ACCEPT [0:0]
 EOF
         for net in $FLOATING_NETWORK_PREFIXES; do
 cat << EOF >> /etc/iptables/rules.v4