[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/72ab505f48504e5a86407319d1d3325f : SUCCESS in 6m 54s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/8050ce91ec1e4b53922e68f1cb0f7431 : FAILURE in 6m 55s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/8790d259916f4f1ea07acef6c41914b9 : FAILURE in 6m 32s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/8d0a91c39a1147aca1c18dbd5c0431e2 : FAILURE in 7m 29s