Comment 1 for bug 1735171

From the list of installed packages we can see that tripleo-common comes from delorean, while tripleo-heat-templates is picked from gating-repo:
https://logs.rdoproject.org/00/523700/2/openstack-check/gate-tripleo-ci-centos-7-containers-multinode-upgrades-pike/Z11e0aa15006e4d6885acda643ba1871d/undercloud/var/log/extra/yum-list-installed.txt.gz

openstack-tripleo-common.noarch 7.6.5-0.20171122034430.37f3f45.el7.centos @delorean
openstack-tripleo-heat-templates.noarch 7.0.6-0.20171129085514.cef58e3.el7.centos @gating-repo

Also, the package version for tripleo-common does not include the Depends-On change submitted in the original patch which adds the LibvirtTLSPassword property:

https://review.openstack.org/#/c/522848/

Depends-On: https://review.openstack.org/#/c/522846/ which is 15 commits over the last patch included in the package openstack-tripleo-common.noarch 7.6.5-0.20171122034430.37f3f45.el7.centos, patch 37f3f45 (https://github.com/openstack/tripleo-common/commits/stable/pike).

For that reason, the password is not set and the mistral workflow fails.