[PATCH 0/5 V5] vhost-scsi: IO error fixups

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The following patches were made over Michael's vhost branch:

https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git/log/?h=vhost

They fixe a couple issues where the guest is getting IO errors:
1. The admin may set num_queues and cmd_per_lun/virtqueue_size
in a way that allows the guest to send more IO that vhost-scsi
was coded for.

2. A race where vhost-scsi completes the cmd to the guest before
it's fully completed in the target/vhost-scsi layers so if the
guest sends a new IO too quicky we fail it.

3. If the real/physical storage (lio backend device) hits a transient
error then vhost-scsi would fail commands instead of relying on
the lower levels error recovery to do what the admin had set up.

V5:
- Bring back V1 but move flush patches to a separate clean up set
- Modify test in vhost_vq_is_setup

V4:
- really really fix compile errors
- dropped threading patches so we can figure that out separately.

V3:
- fix compile errors
- fix possible crash where cmd could be freed while adding it to
completion list
- fix issue where we added the worker thread to the blk cgroup but
the blk IO was submitted by a driver workqueue.

V2:
- fix use before set cpu var errors
- drop vhost_vq_is_setup
- include patches to do a worker thread per scsi IO vq





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