qemu: Yet another check for blkdeviotune values
If you want to set block device I/O tuning values that end with '_max'
and there is nothing else set, libvirt emits an error. In particular:
error: internal error: Unexpected error
That's an unknown error. That is because *_max values depend on their
respective non-_max values. QEMU even says that in the error message
sent as a response to the monitor command:
"error": {"class": "GenericError", "desc": "bps_max/iops_max require
corresponding bps/iops values"}
the problem was that we didn't know that and there was no check for it.
Adding such check makes sure that there will be less confused users.
Signed-off-by: NMartin Kletzander <mkletzan@redhat.com>
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