[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/7630cf76d63f4865ab154a0dd34ea7fb : SUCCESS in 4m 34s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/c74167054a044362b950c11def2aecd9 : FAILURE in 4m 21s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/399210b28d504f77b227d3b7cd5f0669 : FAILURE in 4m 30s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/783c1628fafe4fea94aace95094ba197 : FAILURE in 5m 32s