A few qemuxml2xml tests for virtio-input devices are
missing the capabilities used for the corresponding
qemuxml2argv tests: this wasn't a problem until now
because capabilities were only checked at command line
generation time, but we're going to change that later.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>