[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/f5432ff106ae411d94ac19aa4ef29d5b : SUCCESS in 6m 58s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/43533bb1ce254fdb97e77359eda690b3 : FAILURE in 4m 47s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/0ce1fe9491fb4a879c5a798445472fc5 : FAILURE in 4m 27s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/a7adcf52451045159d65cd9a4cb35201 : FAILURE in 5m 56s