Initial devstack support implemented

* Install climate, climate-nova and climate client
* Sets all needed climate configs, even the nova ones in order to use
climate-nova
* Starts/Stops climate-api and climate-manager
* Creates the Keystone V3 service/endpoint if don't exists.

Change-Id: I7c5014fc61238206ea589b01f3ec0ecac005d846
Implements: blueprint climate-devstack-gating
Co-Authored-By: Pablo Andres Fuente <pablo.a.fuente@intel.com>