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

Build failed. https://zuul.opendev.org/t/openstack/buildset/e0ba219bc2414b5aaa33cc2dd2715a... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/ab67bfc6a4d54c93bf42db31902a5799 : SUCCESS in 5m 40s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/271edf2e47a8415baaba554d53c562a7 : SUCCESS in 4m 52s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/d22e723b319e44a499c2d14701c83241 : SUCCESS in 4m 15s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/b1a9c74893d44dbc8e57936236e4ef2a : FAILURE in 4m 59s