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

Build failed. https://zuul.opendev.org/t/openstack/buildset/0a46536f1f54446aa93007be2a517a...

- openstack-tox-docs https://zuul.opendev.org/t/openstack/build/6df2cabcc90e4d84addd93454866613b : SUCCESS in 4m 03s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/8ae4bc4b4874427aaf80b76613026d26 : SUCCESS in 6m 12s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/73d430aec2a14e849504c03958a4692c : SUCCESS in 5m 36s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/02f295124cc74177a13d3288e9d993be : FAILURE in 4m 03s