[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/266fd7cf54db4adba757c21cfba07702 : SUCCESS in 5m 09s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/3be7fbee3c4c4a4cba5b0fc271939217 : FAILURE in 3m 59s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/9440aafe121743ed8a92f1aacdd94878 : FAILURE in 5m 12s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/3c83cdb19e3f47a5b9370728149c6e14 : FAILURE in 5m 26s