udp: Always hash socket facing flowsides

For UDP packets from the tap interface (like TCP) we use a hash table to
look up which flow they belong to.  Unlike TCP, we sometimes also create a
hash table entry for the socket side of UDP flows.  We need that when we
receive a UDP packet from a "listening" socket which isn't specific to a
single flow.

At present we only do this for the initiating side of flows, which re-use
the listening socket.  For the target side we use a connected "reply"
socket specific to the single flow.

We have in mind changes that maye introduce some edge cases were we could
receive UDP packets on a non flow specific socket more often.  To allow for
those changes - and slightly simplifying things in the meantime - always
put both sides of a UDP flow - tap or socket - in the hash table.  It's
not that costly, and means we always have the option of falling back to a
hash lookup.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

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