Merge remote-tracking branch 'remotes/philmd-gitlab/tags/acceptance-testing-20201026...

Merge remote-tracking branch 'remotes/philmd-gitlab/tags/acceptance-testing-20201026' into staging

Acceptance testing patches

- More ARM tests
- Documentation update

CI jobs results:
. https://cirrus-ci.com/build/5754555684093952
. https://gitlab.com/philmd/qemu/-/pipelines/207807648

# gpg: Signature made Mon 26 Oct 2020 19:06:52 GMT
# gpg:                using RSA key FAABE75E12917221DCFD6BB2E3E32C2CDEADC0DE
# gpg: Good signature from "Philippe Mathieu-Daudé (F4BUG) <f4bug@amsat.org>" [full]
# Primary key fingerprint: FAAB E75E 1291 7221 DCFD  6BB2 E3E3 2C2C DEAD C0DE

* remotes/philmd-gitlab/tags/acceptance-testing-20201026:
  docs/devel/testing.rst: Update outdated Avocado URLs
  tests/acceptance: Allow running Orange Pi test using cached artifacts
  tests/acceptance: Add a 'virt_kvm' test using the GICv3
  tests/boot_linux_console: Boot Trusted Firmware-A on the Raspberry Pi 3

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>