block/nbd: split nbd_establish_connection out of nbd_client_connect
We are going to implement non-blocking version of nbd_establish_connection, which for a while will be used only for nbd_reconnect_attempt, not for nbd_open, so we need to call it separately. Refactor nbd_reconnect_attempt in a way which makes next commit simpler. Signed-off-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-Id: <20200727184751.15704-2-vsementsov@virtuozzo.com> Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NEric Blake <eblake@redhat.com>
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