Initial Functional Tests for Fuel Agent

Add functional tests for fuel_agent;
Fix simple_http_driver in fuel_agent_ci;
Fix ssh object in fuel_agent_ci;
Fix enviroment object missing imports;

Partially implements: blueprint image-based-provisioning
Change-Id: Ic6739ff9c20547c5d9ab2b4fe9dec45bd5742db9
Merge "Initial Functional Tests for Fuel Agent"