CS-15094: Fix multiply vlan of redundang router

This fix would work because:
1. When booting up the router, there is possible that no ip information have
been set for the interface(CS would do it after confirm router is up), so the
interface isn't associate with any ip, then ifconfig cannot work. We have to use
ifup, this is especially true for the first router become master.

2. After booting up phase, the ip would be associated with interfaces, then we
can use ifconfig to bring them up.

patches/systemvm/debian/config/root/redundant_router/enable_pubip.sh.templ

@@ -21,8 +21,14 @@ set -e
 ip link|grep BROADCAST|grep -v eth0|grep -v eth1|cut -d ":" -f 2 > /tmp/iflist
 while read i
 do
-    ifdown $i
-    ifup $i
+    if [ "$i" == "eth2" ]
+    then
+        ifdown $i
+        ifup $i
+    else
+        ifconfig $i down
+        ifconfig $i up
+    fi
 done < /tmp/iflist
 ip route add default via [GATEWAY] dev eth2 && \
 service cloud-passwd-srvr restart && \