ms: Lua part of location update testing

The lua part to start the MS and then signal the first
successful Location Update.

Change-Id: Ica5aa0c2f86d0e5d8a2bc4dc0652de18762dd156

src/osmo_gsm_tester/templates/osmo-mobile-lu.lua.tmpl

@@ -0,0 +1,18 @@
+package.path = '${test.lua_support}/?.lua;' .. package.path
+event = require('ms_support')
+send = 1
+
+function mm_cb(new_state, new_substate, old_substate)
+        if new_state == 19 and new_substate == 1 and send == 1 then
+            send = 0
+            event.send({lu_done=1})
+        end
+end
+
+local cbs = {
+        Mm=mm_cb
+}
+osmo.ms():register(cbs)
+osmo.ms().start()
+
+event.register(osmo.ms():number(), "${test.event_path}")