Merge remote-tracking branch 'remotes/elmarco/tags/podman-pull-request' into staging

Merge remote-tracking branch 'remotes/elmarco/tags/podman-pull-request' into staging

tests/docker: add podman support

# gpg: Signature made Thu 22 Aug 2019 14:46:51 BST
# gpg:                using RSA key 87A9BD933F87C606D276F62DDAE8E10975969CE5
# gpg:                issuer "marcandre.lureau@redhat.com"
# gpg: Good signature from "Marc-André Lureau <marcandre.lureau@redhat.com>" [full]
# gpg:                 aka "Marc-André Lureau <marcandre.lureau@gmail.com>" [full]
# Primary key fingerprint: 87A9 BD93 3F87 C606 D276  F62D DAE8 E109 7596 9CE5

* remotes/elmarco/tags/podman-pull-request:
  test: skip tests if socket_check_protocol_support() failed
  test-char: skip tcp tests if ipv4 check failed
  tests: specify the address family when checking bind
  tests/docker: add podman support
  docker.py: add podman support
  docker.py: add --run-as-current-user

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