Enable deployment of centralized logging

TripleO should have a possibility to automatically setup and install the centralized logging stack (Elasticsearch, FluentD and Kibana) to service the overcloud.

All components of the centralized logging will be deployed by TripleO using Heat+Puppet. The elasticsearch, kibana and fluentd as a log relay/transformer will be deployed on a stand alone node deployed by the undercloud, with a dedicated purpose for all optools (not only centralized logging, but also performance monitoring and availability monitoring in future).
The Optools node will be deployed as a separate Heat stack to the overcloud stack.

The FluentD as a log collection agent will be deployed as a composable role on the overcloud stack.