[5.8] Use real classname for seeders

[jerguslejko]

This way, if a programmer decides to override (example below) a seeder in a container, an actual class name is printed instead of the parent class name.

Example:

I'm working on a multi-tenant app, where each tenant has its own "configuration" folder (contains a service provider and some additional classes such as seeders for example). I can choose which configuration is enabled by tweaking an environment variable.

class PostsSeeder {}

class TenantAPostsSeeder extends PostsSeeder {}

With this change, I'll be able to tell which seeder is actually being executed when I run php artisan db:seed

[antonkomarev]

@jerguslejko Thank you for that feature!