netifd: support DHCP sendopts as list options

Support config in the form of ....
	add_list sendopts=router:10.10.10.2
	add_list sendopts=nissrv:20.20.20.2
	add_list sendopts=0x7D:abba

This allows to configure sendopts having white spaces as option value

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>

package/network/config/netifd/Makefile

@@ -1,7 +1,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=netifd
-PKG_RELEASE:=3
+PKG_RELEASE:=4
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(PROJECT_GIT)/project/netifd.git

package/network/config/netifd/files/lib/netifd/proto/dhcp.sh

@@ -16,7 +16,7 @@ proto_dhcp_init_config() {
 	proto_config_add_string 'reqopts:list(string)'
 	proto_config_add_boolean 'defaultreqopts:bool'
 	proto_config_add_string iface6rd
-	proto_config_add_string sendopts
+	proto_config_add_array 'sendopts:list(string)'
 	proto_config_add_boolean delegate
 	proto_config_add_string zone6rd
 	proto_config_add_string zone
@@ -25,21 +25,23 @@ proto_dhcp_init_config() {
 	proto_config_add_boolean classlessroute
 }
 
+proto_dhcp_add_sendopts() {
+	[ -n "$1" ] && append "$3" "-x $1"
+}
+
 proto_dhcp_setup() {
 	local config="$1"
 	local iface="$2"
 
 	local ipaddr hostname clientid vendorid broadcast release reqopts defaultreqopts iface6rd sendopts delegate zone6rd zone mtu6rd customroutes classlessroute
-	json_get_vars ipaddr hostname clientid vendorid broadcast release reqopts defaultreqopts iface6rd sendopts delegate zone6rd zone mtu6rd customroutes classlessroute
+	json_get_vars ipaddr hostname clientid vendorid broadcast release reqopts defaultreqopts iface6rd delegate zone6rd zone mtu6rd customroutes classlessroute
 
 	local opt dhcpopts
 	for opt in $reqopts; do
 		append dhcpopts "-O $opt"
 	done
 
-	for opt in $sendopts; do
-		append dhcpopts "-x $opt"
-	done
+	json_for_each_item proto_dhcp_add_sendopts sendopts dhcpopts
 
 	[ -z "$hostname" ] && hostname="$(cat /proc/sys/kernel/hostname)"
 	[ "$defaultreqopts" = 0 ] && defaultreqopts="-o" || defaultreqopts=