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

Build failed. https://zuul.opendev.org/t/openstack/buildset/bedf85912b624d44ab2f8d1c25f9a0... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/87ea6e25c57245ce8f78049cccd14585 : SUCCESS in 7m 03s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/539d427519de4ee48afb21f988ae1e1c : SUCCESS in 7m 35s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/608fa33a8832420e9124c52fcf802347 : SUCCESS in 3m 46s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/f889e1fe94884d5a9d0f6f6656d43b7a : FAILURE in 3m 11s