Moving network query helper functions to Network.hs

So far, a couple of helper function for the network
queries resided in Config.hs. I figured it makes more
sense to move them to Query/Network.hs, since they are
very tailored to that purpose.

Signed-off-by: Helga Velroyen <helgav@google.com>
Reviewed-by: Michele Tartara <mtartara@google.com>