Merge tag 'pull-request-2021-12-22' of https://gitlab.com/thuth/qemu into staging

Merge tag 'pull-request-2021-12-22' of https://gitlab.com/thuth/qemu into staging

* Fixes for the virtio-net-failover test
* Silence warnings in the boot-serial-test
* Make qtests more flexible wrt missing machines and devices

# gpg: Signature made Wed 22 Dec 2021 01:20:18 AM PST
# gpg:                using RSA key 27B88847EEE0250118F3EAB92ED9D774FE702DB5
# gpg:                issuer "thuth@redhat.com"
# gpg: Good signature from "Thomas Huth <th.huth@gmx.de>" [unknown]
# gpg:                 aka "Thomas Huth <thuth@redhat.com>" [unknown]
# gpg:                 aka "Thomas Huth <th.huth@posteo.de>" [unknown]
# gpg:                 aka "Thomas Huth <huth@tuxfamily.org>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 27B8 8847 EEE0 2501 18F3  EAB9 2ED9 D774 FE70 2DB5

* tag 'pull-request-2021-12-22' of https://gitlab.com/thuth/qemu:
  tests/qtest/virtio-net-failover: Use g_file_open_tmp() to create temporary file
  tests/qtest/boot-order-test: Check whether machines are available
  tests/qtest/cdrom-test: Check whether devices are available before using them
  tests/qtest: Improve endianness-test to work with missing machines and devices
  tests/qtest: Add a function that checks whether a device is available
  MAINTAINERS: Update COLO Proxy section
  tests/qtest: Make the filter tests independent from a specific NIC
  tests/qtest/boot-serial-test: Silence the warning about deprecated sga device
  failover: Silence warning messages during qtest

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>