[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/8cf0e6f8349742db9f12c918de79b04e : SUCCESS in 8m 26s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/c499c89cc16047e5af7741f3ea872770 : SUCCESS in 8m 35s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/f903e248900d430f85aa1f70ae934a23 : FAILURE in 8m 12s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/da75b48a44bd4348af2855271bbfd827 : SUCCESS in 8m 31s