[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/913bfd671a0b4ad59ddf0fa0d8044d03 : SUCCESS in 7m 21s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/9f8dff13ce0e4867ad3f0b6f0c49cd4b : FAILURE in 6m 31s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/7e38f26d0fe1426788d537e1aae09fe4 : FAILURE in 5m 40s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/da83be353f06476d9da0fa4c1d0cb3f6 : FAILURE in 5m 46s