made ping actually live in the right namespace whoops

lib/netutil.lua

@@ -20,7 +20,7 @@ function netutil.exportfs(path)
  end
 end
 
-function ping(addr,times,timeout)
+function netutil.ping(addr,times,timeout)
  local times, timeout = times or 5, timeout or 30
  for i = 1, times do
   local ipt = computer.uptime()