minor #181 Use ::class pseudo constants in Configuration::getConfigTreeBuilder() (phansys)

This PR was merged into the 3.x branch.

Discussion
----------

|Q            |A  |
|---          |---|
|Branch       |3.x|
|Bug fix?     |no |
|New feature? |no |
|BC breaks?   |no |
|Deprecations?|no |
|Tests pass?  |yes|
|Fixed tickets|n/a|
|License      |MIT|
|Doc PR       |n/a|

Commits
-------

35803fb Use `::class` pseudo constants in `Configuration::getConfigTreeBuilder()`

Author: phansys

DependencyInjection/Configuration.php

@@ -11,11 +11,13 @@
 
 namespace Hackzilla\Bundle\TicketBundle\DependencyInjection;
 
+use Hackzilla\Bundle\TicketBundle\Entity\Ticket;
+use Hackzilla\Bundle\TicketBundle\Entity\TicketMessage;
 use Symfony\Component\Config\Definition\Builder\TreeBuilder;
 use Symfony\Component\Config\Definition\ConfigurationInterface;
 
 /**
- * This is the class that validates and merges configuration from your app/config files.
+ * This is the class that validates and merges configuration from your config files.
  *
  * To learn more see {@link http://symfony.com/doc/current/cookbook/bundles/extension.html#cookbook-bundles-extension-config-class}
  *
@@ -43,8 +45,8 @@ public function getConfigTreeBuilder()
                     ->defaultValue('messages')
                 ->end()
                 ->scalarNode('user_class')->isRequired()->cannotBeEmpty()->end()
-                ->scalarNode('ticket_class')->cannotBeEmpty()->defaultValue('Hackzilla\Bundle\TicketBundle\Entity\Ticket')->end()
-                ->scalarNode('message_class')->cannotBeEmpty()->defaultValue('Hackzilla\Bundle\TicketBundle\Entity\TicketMessage')->end()
+                ->scalarNode('ticket_class')->cannotBeEmpty()->defaultValue(Ticket::class)->end()
+                ->scalarNode('message_class')->cannotBeEmpty()->defaultValue(TicketMessage::class)->end()
                 ->arrayNode('features')
                     ->addDefaultsIfNotSet()
                     ->children()