[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/3a4cefb0987d4fe3a63f66fb343fe10f : SUCCESS in 6m 03s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/17ee13b083964ba181b158f73e424df6 : FAILURE in 4m 04s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/43c03ac9b58046e29f95b51ef4411168 : FAILURE in 6m 35s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/2c43d633581c49bfa9b21d7256a50bdc : FAILURE in 6m 18s