fix deprecated warnings

[rommelfreddy]

[Maxooo]

Hello Freddy,

Be careful when you replace the ContainerAwareCommand with the single Command one and be sure that the getContainer()method is not called inside the command.

For example, in the PruneCommand you can see the following statement line 29 :

$pruner = $this->getContainer()->get('glooby_task.queue_pruner');

In this precise case you may inject the glooby_task.queue_pruner service inside the command to avoid an error and to keep the original behavior.