[Openstack-stable-maint] Stable check of openstack/tooz for ref refs/heads/stable/train failed

Build failed. https://zuul.opendev.org/t/openstack/buildset/c2cd6f02ee2c4f8690793f66b6cb99... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/437fe128b0cd4c8eaad622feb05f23c2 : SUCCESS in 6m 01s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/675c1ee5c8044e9ebf093030aa886998 : FAILURE in 5m 07s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/57f1be1d1c644a23a41fcf06f98eb339 : FAILURE in 5m 51s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/2ddb877552ab44788897f29c85846050 : FAILURE in 5m 27s