The change modifies the neutron 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: Ia9e4acdb86c1c61db182771658d6a175a4c45b38
f27e5a8058