Master - make order steps working on front office for symfony 4.1 - PR 2

[salamichel]

Subject

Make the order process working on front for symfony >4.1.

Closes #601 #610

Changelog

### Changed
- inject alias 'sonata.basket.factory' into basket controller
- change  'Free delivery' to 'free_address_required' in accordance with documentation https://sonata-project.org/bundles/ecommerce/master/doc/reference/bundles/delivery.html

[salamichel]

@greg0ire Hi, could you please review ? the travis issue is regarding xml lint i don't understand what's wrong. rgds

[greg0ire]

You can get some help from FlintCI. Click on Details on the FlintCI line, click the "Download raw diff" button, and apply it with patch -p0. I will give you more hints on the changes tab.

[salamichel]

@greg0ire Hi, thank you for the explanation, it's very sensitive ;), it's should be OK now but travis won't start testing.

[core23]

Thanks @salamichel