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

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 }