nbd: Don't kill server when client requests unknown option

nbd-server.c currently fails to handle unsupported options properly.
If during option haggling the client sends an unknown request, the
server kills the connection instead of letting the client try to
fall back to something older.  This is precisely what advertising
NBD_FLAG_FIXED_NEWSTYLE was supposed to fix.
Signed-off-by: NEric Blake <eblake@redhat.com>
Message-Id: <1459982918-32229-1-git-send-email-eblake@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

nbd/server.c

@@ -483,9 +483,12 @@ static int nbd_negotiate_options(NBDClient *client)
                 return -EINVAL;
             default:
                 TRACE("Unsupported option 0x%x", clientflags);
+                if (nbd_negotiate_drop_sync(client->ioc, length) != length) {
+                    return -EIO;
+                }
                 nbd_negotiate_send_rep(client->ioc, NBD_REP_ERR_UNSUP,
                                        clientflags);
-                return -EINVAL;
+                break;
             }
         } else {
             /*