dnsmasq: support log-dhcp option

Helpful when trying to resolve issues with quirky dhcp client devices.

Signed-off-by: Karl Palsson <karlp@etactica.com>

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

@@ -567,6 +567,7 @@ dnsmasq_start()
 	append_bool "$cfg" fqdn "--dhcp-fqdn"
 	append_bool "$cfg" proxydnssec "--proxy-dnssec"
 	append_bool "$cfg" localservice "--local-service"
+	append_bool "$cfg" logdhcp "--log-dhcp"
 	append_bool "$cfg" quietdhcp "--quiet-dhcp"
 	append_bool "$cfg" sequential_ip "--dhcp-sequential-ip"
 	append_bool "$cfg" allservers "--all-servers"