Change I329c0a3173584109ef1e6f500fdd55e76c10bb8b introduced
a failure condition in the glance-api that was not caught by
role convergence testing but manifested in the AIO gate checks
as:
ERROR glance.image_cache.drivers.base [-] Failed to read image_cache_dir from
config CRITICAL glance [-] BadDriverConfiguration: Driver
glance.image_cache.drivers.sqlite could not be configured correctly. Reason:
Failed to read image_cache_dir from config
in the glance-api.log
Change-Id: I2e6d5fa60c030c7ba229c5271668aabd0271723b
9019bcf44a