[Openstack-stable-maint] Stable check of openstack/tooz for ref refs/heads/stable/train failed

Build failed. - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/0250dd2d18464dd8908602474cdeeb48 : SUCCESS in 6m 46s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/0644e943de114e31bebdc764d11a5e33 : FAILURE in 4m 52s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/4b7a25985276479f9f5fd1ef61813040 : FAILURE in 5m 27s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/2812c22c63df4e26bf519b451ed53566 : FAILURE in 5m 49s