Added Savanna Project

Added services Savanna, Savanna Dashboard, Savanna python client.

Implements blueprint devstack-savanna-support
Implements blueprint devstack-integration

Change-Id: I8725f59a0cc9aef4817988470313136c56711cf1
Merge "Added Savanna Project"
Merge branch 'master' of github.com:openstack-dev/devstack