isc-dhcp: allow hosts to have dhcp options

Sometimes it's necessary to set per-host options like:

    list dhcp_option 'option:always-broadcast,true'

for hosts that don't understand unicast replies.  There might
be other options you might want to set on a per-host basis,
such as extensions-path, dhcp-message-text, etc.

Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>

net/isc-dhcp/Makefile

@@ -10,7 +10,7 @@ include $(TOPDIR)/rules.mk
 PKG_NAME:=isc-dhcp
 UPSTREAM_NAME:=dhcp
 PKG_VERSION:=4.4.0
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_LICENSE:=BSD-3-Clause
 PKG_LICENSE_FILES:=LICENSE

net/isc-dhcp/files/dhcpd.init

@@ -112,6 +112,7 @@ static_host_add() {
 		if [ -n "$gateway" ] ; then
 			echo " option routers $gateway;"
 		fi
+		config_list_foreach "$cfg" "dhcp_option" append_dhcp_options
 		echo "}"
 	done
 }