The change modifies the cinder template tasks such that it's now
using the config_template action plugin. This change will make so that
config files can be dynamically updated, by a deployer, at run time,
without requiring the need to modify the in tree templates or defaults.
Partially implements: blueprint tunable-openstack-configuration
Change-Id: I463bbd3e10895dc2e7788346493f78bc46e5f26e
2de509d108