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Description of problem:
rerror/werror require support in the underlying device model.
Currently, only ide-hd, ide-cd, ide-drive (legacy), scsi-hd, scsi-cd,
scsi-disk (legacy), scsi-block (partially[*]), virtio-blk-device do.

Device models that do not support it: isa-fdc, cfi.pflash01,
scsi-generic, nvme, ...

How reproducible:
Always

Steps to Reproduce:
1. Peruse -help, qemu.1 and qemu-doc.html on rerror/werror.

Actual results:
Not a word on rerror/werror working only with some device models.

Expected results:
Restrictions get explained adequately along with the possible values
of rerror/werror.

Additional info:
Upstream first.

[*] Should work as long as you stick to plain read/write.  Fancy stuff
like write same gets tricky.

> Component: qemu-kvm → qemu-kvm-rhev

Revert, we already have Bug 1179995 (sorry).

WONTFIX in qemu-kvm due to capacity. We don't support direct invocation of qemu-kvm in RHEL anyway.