[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/9627466f11374a16874dfc8f3feea994 : SUCCESS in 4m 51s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/bbdd118b471f4e42a7acbcf3c5e3450a : FAILURE in 3m 56s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/f4b95f42015b49b98c32f18ab69ccb4b : FAILURE in 4m 18s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/8b19173332c245e8a6b18f282dbcf2ff : FAILURE in 4m 58s