QueryNetworks tries to find which instances are connected to which
networks. The query mechanism in Haskell was written back when NICs
referred to a network via its name and not its UUID. Fix luxi to
comply with the current implementation (network slot of NIC object
is a UUID).

Fix old style query mechanism to return a list of names instead of
UUIDs for the instances that are connected to a network.

Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>
Reviewed-by: Helga Velroyen <helgav@google.com>