qemu: capabilities: Always assume QEMU_CAPS_BOOTINDEX

The field was added in qemu v0.13.0-rc0-731-g1ca4d09ae0 so all supported
qemu versions now use it.

There's a LOT of test fallout as we did not use capabilities close
enough to upstream for many of our tests.

Several tests had a 'bootindex' variant. Since they'd become redundant
they are also removed here.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>

tests/qemuxml2argvdata/graphics-spice.args

@@ -19,10 +19,10 @@ server,nowait \
 -rtc base=utc \
 -no-shutdown \
 -no-acpi \
--boot c \
 -usb \
 -drive file=/dev/HostVG/QEMUGuest1,format=raw,if=none,id=drive-ide0-0-0 \
--device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 \
+-device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,\
+bootindex=1 \
 -spice port=5903,tls-port=5904,addr=127.0.0.1,x509-dir=/etc/pki/libvirt-spice,\
 tls-channel=default,tls-channel=main,plaintext-channel=inputs,\
 image-compression=auto_glz,jpeg-wan-compression=auto,\