[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/1d756581ffa44c608b3f9520be4511... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/3afbe8ba47714b49aaf054be30b2a095 : SUCCESS in 3m 47s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/38aacf4a851e4d7ab7bbc454515c50d0 : FAILURE in 3m 00s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/dd13264352b74bc69f8f457eb473dd9a : FAILURE in 2m 57s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/c4cc96a6fe7d464f8f7d8777caabc41c : FAILURE in 2m 38s