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

Build failed. https://zuul.opendev.org/t/openstack/buildset/87fa9b0e32714288bde91d959b7e5f... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/35fcc3280f2f4372ada8a224c9c519d0 : FAILURE in 2m 27s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/5de84212769646419c3455033a4dff3a : FAILURE in 2m 23s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/de2a0b3f046f411ba3724e62191070dc : FAILURE in 2m 39s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/1c0af3a68f764fdeaac0e5572f81b1d2 : FAILURE in 3m 16s