fwd, pif: Replace with pif_sock_l4() with pif_listen()

It turns out all users of pif_sock_l4() use it for "listening" sockets,
which now all have a common epoll reference format.  We can take advantage
of that to pass the necessary epoll information into pif_sock_l4() in a
more natural way, rather than as an opaque u32.

That in turn allows union fwd_listen_ref can become a struct, since the
union only exist to allow the meaningful fields to be coerced into a u32
for pif_sock_l4().

Rename pif_sock_l4() to pif_listen() to reflect the new semantics.  While
we're there, remove the static_assert() on the fwd_listen_ref's size.  We
do still need it to fit into 32 bits, but that constraint is imposed only
by the fact that it needs to fit into the whole, epoll_ref structure,
which we already check with a static_assert() in epoll_ctl.h.

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

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