added path for default container in Symfony 4

[artemoliynyk]

Fixes #1295
By default, Symfony 4 generate application containers based on Kernel properties.

Method Symfony\Component\HttpKernel\Kernel@initializeContainer() use Symfony\Component\HttpKernel\Kernel@getContainerClass() to build file name for container based on following Kernel class properties:

• $name – base dir for Kernel class (src)
• $class – FQN for Kernel class, backslash replaced with underscore (App\Kernel > App_Kernel)
• $environment – configured environment, based on APP_ENV (Dev, Test, Prod, etc.)
• $debug – debug mode, adds Debug to file name, based on APP_DEBUG ("Debug" or empty string)

All these variables prepended to base name "Container".

So, default container filename for DEV environment with Debug enabled will always:
src + App_Kernel +Dev + Debug + Container -> srcApp_KernelDevDebugContainer

Tested on PhpStorm 2019.2.1 with Symfony 4.3 (both on Full Stack Framework and Microservices versions)

[Haehnchen]

thx was thinking of a more complex way, but yes is doing the job on the Symfony standard 👍