[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/a8b42866020e4704b3964bb374558ef6 : SUCCESS in 7m 46s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/8e44a5b44eb14fe5a0b0d168752a18f6 : FAILURE in 6m 39s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/5871b780b85143c89f266217158cb460 : FAILURE in 7m 55s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/2b8264d593b147d1a358a4114268881a : FAILURE in 8m 07s