[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/769a2ba2b74244c1a14cc89efb7b35... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/c68051152363429d86c35732707ed62e : SUCCESS in 4m 32s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/ffec10e655c94df1badbfcc2a5d4802b : FAILURE in 3m 56s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/2b3ff4e17c0c4d7d9df5eda487fc1b1e : FAILURE in 2m 42s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/8cf5b8821d254b1eb4f5f4fa53d935be : FAILURE in 2m 52s