minor #17810 fix YAML syntax in functional tests config (xabbuh)

This PR was merged into the 2.3 branch.

Discussion
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fix YAML syntax in functional tests config

| Q             | A
| ------------- | ---
| Fixed tickets |
| License       | MIT

see failing tests in #17809

Commits
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d9af4bc fix YAML syntax in functional tests config

src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/yml/full.yml

@@ -13,7 +13,7 @@ framework:
         only_exceptions: true
         enabled: false
     router:
-        resource:     %kernel.root_dir%/config/routing.xml
+        resource:     '%kernel.root_dir%/config/routing.xml'
         type:         xml
     session:
         storage_id:      session.storage.native
@@ -54,5 +54,5 @@ framework:
     annotations:
         cache:   file
         debug:   true
-        file_cache_dir: %kernel.cache_dir%/annotations
+        file_cache_dir: '%kernel.cache_dir%/annotations'
     ide: file%%link%%format

src/Symfony/Bundle/SecurityBundle/Tests/Functional/app/config/twig.yml

@@ -3,5 +3,5 @@ framework:
 
 # Twig Configuration
 twig:
-    debug:            %kernel.debug%
-    strict_variables: %kernel.debug%
+    debug:            '%kernel.debug%'
+    strict_variables: '%kernel.debug%'