fwd: Make space to store listening sockets in forward table

At present, we don't keep track of the fds for listening sockets (except
for "auto" ones).  Since the fd is stored in the epoll reference, we didn't
need an alternative source of it for the various handlers.

However, we're intending to allow dynamic changes to forwarding
configuration in future.  That means we need a way to enumerate sockets so
we can close them on removal of a forward.

Extend our forwarding table data structure to make space for all the
listening sockets.  To avoid allocation, this imposes another limit:
we could run out of space for socket fds before we run out of slots
for forwarding rules.

We don't actually do anything with the allocate spaced yet.  For
"auto" forwards it's redundant with existing arrays.  We'll fix both
of those in later patches.

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

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