Hi!

Recently, syzbot started to abuse NBD with all kinds of sockets.

Commit cf1b2326b734 ("nbd: verify socket is supported during setup")
made sure the socket supported a shutdown() method.

Explicitely accept TCP and UNIX stream sockets.

Note that running nbd server and client on same machine is not safe in
read-write mode. It may deadlock under low memory conditions.

Thus I'm not sure if we should accept UNIX sockets.

Best regards,
								Pavel
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