create user

package/dhcp-forwarder/files/dhcp-forwarder.postinst

@@ -1,3 +1,6 @@
 #!/bin/sh
 . $IPKG_INSTROOT/etc/functions.sh
+gid=$(get_next_gid)
+add_group dhcp-fwd $gid
+add_user dhcp-fwd $(get_next_uid) $gid /tmp
 add_rcconf dhcp_fwd dhcp_fwd NO