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

Build failed. https://zuul.opendev.org/t/openstack/buildset/e2111ff8029a4395843b44c55ba0ef... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/372556a17650483da23b3076ba7159f0 : SUCCESS in 4m 50s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/536918719a974700993927eb45a8861c : SUCCESS in 4m 45s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/eae7d5f4cb2b4ca3b70231bdbc59bb85 : SUCCESS in 4m 23s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/a466a35a1da4419e994dba888a45c0f9 : FAILURE in 4m 09s