[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/4107b8abab3e4677a021c9859cb22433 : SUCCESS in 5m 28s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/60d09c9d917e498fbd66c097d8ce8713 : FAILURE in 4m 35s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/fe52ea84d6cf488383adc63d0dd962b3 : FAILURE in 4m 56s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/0f0f8e2e908840f4bfb6010f797cea49 : FAILURE in 5m 08s