Sahara Integration

Sahara Integration

Integration of OpenStack data processing service (sahara) with
TripleO.

- Deploys sahara in distributed mode (separate api and engine
  processes on each controller node)
- Load balancing w/haproxy
- RabbitMQ/MySQL supported per current TripleO standard
- Minimal configurability at this time

Change-Id: I77a6a69ed5691e3b1ba34e9ebb4d88c80019642c
Partially-implements: blueprint sahara-integration
Depends-On: I0f0a1dc2eaa57d8226bad8cfb250110296ab9614
Depends-On: Ib84cc59667616ec94e7edce2715cbd7dd944f4ae
Depends-On: I9fe321fd4284f7bfd55bd2e69dcfe623ed6f8a2a