udp: Consolidate datagram batching

When we receive datagrams on a socket, we need to split them into batches
depending on how they need to be forwarded (either via a specific splice
socket, or via tap).  The logic to do this, is somewhat awkwardly split
between udp_buf_sock_handler() itself, udp_splice_send() and
udp_tap_send().

Move all the batching logic into udp_buf_sock_handler(), leaving
udp_splice_send() to just send the prepared batch.  udp_tap_send() reduces
to just a call to tap_send_frames() so open-code that call in
udp_buf_sock_handler().

This will allow separating the batching logic from the rest of the datagram
forwarding logic, which we'll need for upcoming flow table support.

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

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