avocado run option --vt-extra-params doesn't work

[liuyd96]

Hi, all.

I failed to customize a guest by using '--vt-extra-params'.

# avocado run --vt-type libvirt --vt-arch aarch64 --vt-machine-type arm64-mmio \
> unattended_install.import.import.default_install.aio_native \
> --vt-extra-params mem=32768
WARNING:root:No python imaging library installed. Screendump and Windows guest BSOD detection are disabled. In order to enable it, please install python-imaging or the equivalent for your distro.
WARNING:root:No python imaging library installed. PPM image conversion to JPEG disabled. In order to enable it, please install python-imaging or the equivalent for your distro.
Unable to resolve reference(s) 'unattended_install.import.import.default_install.aio_native' with plugins(s) 'file', 'vt', 'tap', 'external', try running 'avocado -V list unattended_install.import.import.default_install.aio_native' to see the details.

Remove '--vt-extra-params' , test runs well.

# avocado run --vt-type libvirt --vt-arch aarch64 --vt-machine-type arm64-mmio \
> unattended_install.import.import.default_install.aio_native
WARNING:root:No python imaging library installed. Screendump and Windows guest BSOD detection are disabled. In order to enable it, please install python-imaging or the equivalent for your distro.
WARNING:root:No python imaging library installed. PPM image conversion to JPEG disabled. In order to enable it, please install python-imaging or the equivalent for your distro.
JOB ID     : f12faa7db86b5f8eba006495a3ddb3af82b3619a
JOB LOG    : /root/avocado/job-results/job-2021-05-10T23.44-f12faa7/job.log
 (1/1) io-github-autotest-qemu.unattended_install.import.import.default_install.aio_native: PASS (50.48 s)
RESULTS    : PASS 1 | ERROR 0 | FAIL 0 | SKIP 0 | WARN 0 | INTERRUPT 0 | CANCEL 0
JOB TIME   : 51.19 s

I don't know whether it is a regression. But i recalled '--vt-extra-params' worked in the past. (Around 2020/10 ?)

I build avocado avocado-vt from upstream source codes.