[FrameworkBundle][Console] Load command from DIC after command from bundles.

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

It's better to load a command from DIC after other one. Because it allow easy
override of default (symfony/assetic/doctrine) command. The end user could do:

    # config.yml
    services:
       assetic.command.dump:
           class: SensioLabs\Shim\Assetic\DumpCommand
           tags:
               - { name: console.command }

**Note**: This is not a new feature... It could be very cool to have it for symfony 2.4 ;)