CLOUDSTACK-4199 Fixed redundant router fail over

When master router down, the back up router is entered into FAIL state
but it supposed to enter into master.
This issue is happening because the the enable_pubip.sh script triying to
ifdown and ifup the eth2 interface. Which is failed. So master.sh script got
failed. Fixed by doing ifdown force

patches/systemvm/debian/config/etc/init.d/cloud-early-config

@@ -484,7 +484,7 @@ disable_hvc() {
 
 enable_vpc_rpsrfs() {
     local enable=$1
-    if [ $eanble -eq 0]
+    if [ $enable -eq 0 ]
     then
         echo 0 > /etc/rpsrfsenable
     else
@@ -497,7 +497,7 @@ enable_vpc_rpsrfs() {
 enable_rpsrfs() {
   local enable=$1
 
-  if [ $eanble -eq 0]
+  if [ $enable -eq 0 ]
   then
       echo 0 > /etc/rpsrfsenable
       return 0

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

@@ -23,7 +23,7 @@ while read i
 do
     if [ "$i" == "eth2" ]
     then
-        ifdown $i
+        ifdown $i --force
         ifup $i
     else
         ifconfig $i down