[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/934768b747c94b4cacbda338bb4c2e00 : SUCCESS in 7m 29s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/a30f7fdd44f44f30932f5c0e60c1c8aa : FAILURE in 5m 16s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/a04217df0c9a4b0bb5ddc5233db957da : FAILURE in 5m 52s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/0526cc76852946e581e645e73564e68e : FAILURE in 5m 44s