[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/955a1a2d708c4753a8e552a50412400f : SUCCESS in 6m 55s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/e7f232c208f94adb8175367b16cd7155 : FAILURE in 6m 06s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/d22e83f912ff4510b21ef80c1e5d7fa7 : FAILURE in 7m 04s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/5f49914e3ca84711be45e5dee7504583 : FAILURE in 7m 54s