Don't use :redis_store in development environment
Created by: pbrit
This commit fixes small problem. The problem is if you try to start gitlabhq application in development environment with non-default redis port (e. g. it's possible if you use @boxen) you will have Rack exception (Redis on 127.0.0.1:6379 (ECONNREFUSED)).
Improper session_store configuration causes such a problem.