[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/79fe3f31d31749e99c202f73e5ae4839 : SUCCESS in 6m 51s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/155199c1442e4d4d8c09b5e0bace11a3 : FAILURE in 6m 22s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/670a8009cf6244afb0331aa978c82b10 : FAILURE in 7m 29s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/f6b0f3b245894601a761e18dded810ba : FAILURE in 7m 33s