[2.2] [FrameworkBundle] Add events to console commands

Bug fix: no
Feature addition: yes
Backwards compatibility break: no
Symfony2 tests pass: [![Build Status](https://secure.travis-ci.org/flevour/symfony.png?branch=standard-events-cli)](http://travis-ci.org/flevour/symfony?branch=standard-events-cli)

Fixes the following tickets: #1929
Todo: 
* tests needed?