Previously, when running one of the following commands:

  kolla-ansible deploy --check
  kolla-ansible genconfig --check

deployment or configuration generation fails for various reasons.

MariaDB fails to lookup the existing cluster.

Keystone fails to generate cron config.

Nova-cell fails to get the cell settings.

Closes-Bug: #2002661
Change-Id: I5e765f498ae86d213d0a4379ca5d473db1499962