[doc-day] Updated development environment guide
[doc-day] Updated development environment guide

Added commands to set up RabbitMQ and launch Sahara API and Engine.

Change-Id: I0d208d3f824132ef3528f5631edfb8e84182165e

openstack/sahara,crobby/sahara,tellesnobrega/sahara,zhangjunli177/sahara,tellesnobrega/sahara,zhangjunli177/sahara,egafford/sahara,egafford/sahara,zhangjunli177/sahara,crobby/sahara,crobby/sahara,openstack/sahara