scenario003: configure Keystone tokens with Fernet provider
scenario003: configure Keystone tokens with Fernet provider

Improve scenario003 to configure Keystone tokens with Fernet provider.
Scenario001 and scenario002 will still deploy uuid for now.

Change-Id: I8c671d0371b2c3590b58b9623bb0df0b0c625a5b

dprince/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates,openstack/tripleo-heat-templates