add opentracker package

support for opentracker was suggested in ticket #7023
it's much tighter than cbtt and got only 20% of cbtt binary size

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

net/opentracker/files/opentracker.init

@@ -0,0 +1,16 @@
+#!/bin/sh /etc/rc.common
+
+START=10
+STOP=15
+
+NAME="opentracker"
+PROG="/usr/bin/opentracker"
+OPTIONS="-f /etc/opentracker.conf"
+USE_PROCD=1
+
+start_service()
+{
+	procd_open_instance
+	procd_set_param command $PROG $OPTIONS
+	procd_close_instance
+}