qemu: add support for splash-timeout

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1021703

Signed-off-by: Martin Kletzander <mkletzan@redhat.com>

tests/qemuxml2argvdata/qemuxml2argv-boot-menu-enable-with-timeout.args

@@ -0,0 +1,15 @@
+LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test QEMU_AUDIO_DRV=none \
+/usr/bin/qemu \
+-S \
+-M pc \
+-m 214 \
+-smp 1 \
+-nographic \
+-nodefaults \
+-monitor unix:/tmp/test-monitor,server,nowait \
+-no-acpi \
+-boot order=d,menu=on,splash-time=3000 \
+-usb \
+-drive file=/dev/cdrom,if=none,media=cdrom,id=drive-ide0-1-0 \
+-device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 \
+-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3