dnsmasq: add 'scriptarp' option

Add option 'scriptarp' to uci dnsmasq config to enable --script-arp functions.
The default setting is false, meaning any scripts in `/etc/hotplug.d/neigh` intended
to be triggered by `/usr/lib/dnsmasq/dhcp-script.sh` will fail to execute.

Also enable --script-arp if has_handlers returns true.

Signed-off-by: Jordan Sokolic <oofnik@gmail.com>
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com> [PKG_RELEASE increase]

package/network/services/dnsmasq/Makefile

@@ -10,7 +10,7 @@ include $(TOPDIR)/rules.mk
 PKG_NAME:=dnsmasq
 PKG_UPSTREAM_VERSION:=2.80
 PKG_VERSION:=$(subst test,~~test,$(subst rc,~rc,$(PKG_UPSTREAM_VERSION)))
-PKG_RELEASE:=15
+PKG_RELEASE:=16
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_UPSTREAM_VERSION).tar.xz
 PKG_SOURCE_URL:=http://thekelleys.org.uk/dnsmasq

package/network/services/dnsmasq/files/dnsmasq.init

@@ -866,6 +866,7 @@ dnsmasq_start()
 	append_bool "$cfg" allservers "--all-servers"
 	append_bool "$cfg" noping "--no-ping"
 	append_bool "$cfg" rapidcommit "--dhcp-rapid-commit"
+	append_bool "$cfg" scriptarp "--script-arp"
 
 	append_parm "$cfg" logfacility "--log-facility"
 
@@ -915,6 +916,7 @@ dnsmasq_start()
 	config_get user_dhcpscript $cfg dhcpscript
 	if has_handler || [ -n "$user_dhcpscript" ]; then
 		xappend "--dhcp-script=$DHCPSCRIPT"
+		xappend "--script-arp"
 	fi
 
 	config_get leasefile $cfg leasefile "/tmp/dhcp.leases"