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

Build failed. https://zuul.opendev.org/t/openstack/buildset/5c04334e1da24623a590f438e94003... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/d83b7a34da3b44a5a7fa1402a665fdcf : SUCCESS in 4m 36s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/4c1666454afd4ea6b59b0f2059a232c0 : SUCCESS in 2m 53s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/19429b7cd15041678d52b5e3e7ce52eb : SUCCESS in 3m 55s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/f0b1e18c595c4c04adb63cf0fe322f5d : FAILURE in 2m 33s