Description of problem: No output of the actual failure (as rpm-python is usually insntalled) but even if rpm-python is not present, the upgrade goes on until it fails.
Bump into this while reading the code.
unable to reproduce : openstack-tripleo-heat-templates-5.0.0-1.2.el7ost.noarch
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.