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

Build failed. https://zuul.opendev.org/t/openstack/buildset/f70dcd5390cf4e84a0a1ac5d2e8ddb... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/e384b040d1dd42b7af3a1b74d7b512b7 : SUCCESS in 4m 59s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/8687062eb8d44240a52ecada95bab07d : SUCCESS in 4m 58s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/6bf064435a544b5ca75c99e886249b52 : SUCCESS in 4m 04s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/44b7119342414fdebec1383396924e69 : FAILURE in 4m 17s