nbd/client: Trace all server option error messages
Not all servers send free-form text alongside option error replies, but for servers that do (such as qemu), we pass the server's message as a hint alongside our own error reporting. However, it would also be useful to trace such server messages, since we can't guarantee how the hint may be consumed. Signed-off-by: NEric Blake <eblake@redhat.com> Message-Id: <20181218225714.284495-3-eblake@redhat.com> Reviewed-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
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