minor #18139 [FrameworkBundle] Replace kernel.debug with member variable (patrick-mcdougle)

This PR was merged into the 2.7 branch.

Discussion
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[FrameworkBundle] Replace kernel.debug with member variable

| Q             | A
| ------------- | ---
| Branch        | 2.7
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | unlikely
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

While digging around I noticed that someone added debug to the constructor, but didn't replace all the `%kernel.debug%` strings. This PR is just to improve consistency.

Technically this could cause a BC break if someone was using a compiler pass to alter the argument of the constructor while the other config was relying on `%kernel.debug%`, but the likelihood of that is probably very low.

Commits
-------

181f256 Use debug member variable

src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php

@@ -654,7 +654,7 @@ class Configuration implements ConfigurationInterface
                     ->children()
                         ->scalarNode('cache')->defaultValue('file')->end()
                         ->scalarNode('file_cache_dir')->defaultValue('%kernel.cache_dir%/annotations')->end()
-                        ->booleanNode('debug')->defaultValue('%kernel.debug%')->end()
+                        ->booleanNode('debug')->defaultValue($this->debug)->end()
                     ->end()
                 ->end()
             ->end()

src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/ConfigurationTest.php

@@ -169,7 +169,7 @@ class ConfigurationTest extends \PHPUnit_Framework_TestCase
             'annotations' => array(
                 'cache' => 'file',
                 'file_cache_dir' => '%kernel.cache_dir%/annotations',
-                'debug' => '%kernel.debug%',
+                'debug' => true,
             ),
             'serializer' => array(
                 'enabled' => false,