The tripleo-validations are executed from the mistral_executor container. Some validations check out multiple services config files located in /var/lib/config-data/puppet-generated/ on the undercloud host. This container don't have access to this tree and those validations are failing. A bind-mount of this tree should be created for the mistral_executor.
[stack@undercloud-0 ~]$ rpm -q openstack-tripleo-heat-templates
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.