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

Build failed. - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/e394d3e670af4322a8d11c2d9f0400cf : SUCCESS in 6m 12s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/ec9b661d270b4629863eb5a587a54042 : FAILURE in 5m 32s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/6ec30e3a0819463590fe33ab088ceebd : FAILURE in 7m 32s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/6e1fd608c9634372ac7408d6f013c2e6 : FAILURE in 6m 56s