[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/f3d4a1df21624304bcbd7a687d1acb77 : SUCCESS in 8m 54s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/44a0b0f05eba469dbafa7efc9d9aacb2 : FAILURE in 5m 56s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/80fe923b828b40938d13135133828646 : FAILURE in 9m 42s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/16e888039de7436384424b7854457970 : FAILURE in 7m 05s