generic userid: use the new USERID api

recent changes in trunk allow us to specify the userid inside the openwrt makefile.
the info is stored int he meta data of the IPK contorl file and users are generated
by the new generic postinst trigger.

Signed-off-by: John Crispin <blogic@openwrt.org>

net/ocserv/files/ocserv.init

@@ -86,9 +86,6 @@ setup_dns() {
 start() {
 	local hostname iface
 
-	user_exists ocserv 72 || user_add ocserv 72 72 /var/lib/ocserv
-	group_exists ocserv 72 || group_add ocserv 72
-
 	hostname=`uci get ddns.myddns.domain`
 	[ -z "$hostname" ] && hostname=`uci get system.@system[0].hostname`