qemu: rework '-serial none'
Limiting ourselves to qemu without QEMU_CAPS_DEVICE capability, we
used '-serial none' only if there was no serial device defined in the
domain XML. This means that if we want to have a possibility of the
device being defined in XML, but not used in the command-line
(e.g. when it's pointless), we'll fail to attach '-serial none' to the
command-line (when skipping the device's command-line building and the
device being the only one).
Since there is no such device, this patch doesn't actually do
anything, but enables easier future additions in this manner.
Signed-off-by: NMartin Kletzander <mkletzan@redhat.com>
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