Bug 1292567

+++ This bug was initially created as a clone of Bug #1289289 +++

Description of problem:
It seems like the versions of Heira supplied with RHEL 7.2 and the one needed for Packstack in RHEL-OSP 8.0 are incompatible. It appears to be a mismatch in the /etc/puppet/hiera.yaml file as to the yaml files it's searching for to find the variable data needed for installation. The version supplied is looking for "common" in the yaml file name whereas the files provided use the older nomenclature of "defaults". This causes the first variable lookup to fail. 

Version-Release number of selected component (if applicable):
puppet-3.6.2-3.el7.noarch
openstack-packstack-puppet-7.0.0-0.8.dev1661.gaf13b7e.el7ost.noarch
openstack-puppet-modules-7.0.3-1.el7ost.noarch


How reproducible:
This bug appears to be reproducible 100% of the time when using Packstack in RHEL-OSP 8.0

Steps to Reproduce:
1. Install RHEL 7.2
2. Install OpenStack Packstack (sudo yum install -y openstack-packstack)
3. Generate an answer file (packstack --gen-answer-file=answers.txt)
4. Use the answer file to install OpenStack (packstack --answer-file=answers.txt)
5. Note that this can also be done with the --allinone command. It does not seem to depend on the answer file. 

Actual results:
The packstack install process fails on the first variable look up. 

Expected results:
The packstack installation process shall complete successfully.

Additional info:
This appears to be the same issue that affected RDO Liberty detailed in https://bugzilla.redhat.com/show_bug.cgi?id=1284978

You can workaround this issue by modifying /etc/puppet/hiera.yaml and replacing the line
  - common
with
  - defaults 
under the :hierarchy: heading. Note that the packstack installation needs to fail once for this file to be present.