Current usage of TreeBuilder::root method is deprecated

[Javier Eguiluz]

Sorry if this was reported earlier, but I can't find any issue or PR.

Steps to reproduce

1. Upgrade to Symfony 4.3 and you'll see this deprecation message:

The "Symfony\Component\Config\Definition\Builder\TreeBuilder::root()"
method called for the "liip_functional_test" configuration is deprecated 
since Symfony 4.3, pass the root name to the constructor instead.

This is something all Symfony bundles must fix. Here are some examples of how to do it:

• https://github.com/sensiolabs/SensioFrameworkExtraBundle/pull/594/files
• https://github.com/doctrine/DoctrineCacheBundle/pull/148/files

[Alexis Lefebvre]

It should have been fixed in #478, I'll see why there's still a deprecation.

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Edit: no, it was for Symfony 4.1.

[Javier Eguiluz]

Closing as fixe by the linked PR. Thanks.