[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/fb254ee2b200466a932528803bbad2... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/0c6a69958e2d43e4b8b32c0a07813c52 : SUCCESS in 6m 00s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/293c5f312227478d9bedc342cde5d744 : FAILURE in 4m 35s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/97c4c271a61c4ce596ad885065cdb58b : SUCCESS in 4m 11s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/b0402320872547388edca128bc695ca0 : FAILURE in 5m 08s