List of discovered service provider class names or objects.
This is a nested array whose top-level keys are 'app' and 'site', denoting the origin of a service provider. Site-specific providers have to be collected separately, because they need to be processed last, so as to be able to override services from application service providers.
Allowing objects is for example used to allow \Drupal\KernelTests\KernelTestBase to register itself as service provider.
Type: array
protected $serviceProviderClasses;
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!DrupalKernel.php/property/DrupalKernel::serviceProviderClasses/8.1.x