The following patches fix bugs related to the nbd cmd timeout feature. The patches were made over Linus's current tree and also apply over this nbd patch: https://marc.info/?l=linux-block&m=156494582914495&w=2 V2: - Fix patch4 so it allows resetting of the nbd cmd timeout to 0 as well initializing it to 0. - Add Josef's revewied-by tag.
