[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/3f74fce840314de6b5c8bd3a399205... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/ea7fee336cc3483d9d247cb1c5ff94d2 : SUCCESS in 4m 24s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/ad81b35041b4481dadde123ed07617fe : SUCCESS in 2m 47s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/e5a0be35dcae4d759963952069aa5750 : SUCCESS in 2m 37s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/1234e3a50d704afc8446b79ad5c77e5c : FAILURE in 2m 39s