[Feature][ZXW-452]merge P54U02 version

Only Configure: No
Affected branch: master
Affected module: unknow
Is it affected on both ZXIC and MTK: only ZXIC
Self-test: Yes
Doc Update: No

Change-Id: I17e6795ab66e2b9d1cbbfec4b7c0028d666e177d
diff --git a/ap/app/Script/scripts/wan_ipv4.sh b/ap/app/Script/scripts/wan_ipv4.sh
index e985e7b..7c0ba39 100755
--- a/ap/app/Script/scripts/wan_ipv4.sh
+++ b/ap/app/Script/scripts/wan_ipv4.sh
@@ -116,10 +116,7 @@
 		pswan_secdns=`nv get $wan_if"_secdns"`
 		pswan_nm=`nv get $wan_if"_nm"`
 		
-		ifconfig $wan_if down 2>>$test_log
-		if [ $? -ne 0 ];then
-	        echo "Error: ifconfig $wan_if down failed." >> $test_log
-        fi
+		#ifconfig $wan_if down 2>>$test_log
 		ifconfig $wan_if $pswan_ip netmask 255.255.255.0 up 2>>$test_log
 		if [ $? -ne 0 ];then
 	        echo "Error: ifconfig $wan_if $pswan_ip up failed." >> $test_log