[ticket/12620] Add the support of the environments for the ext services

We look for an environment.yml file in the config/PHPBB_ENVIRONMENT/
directory of the extensionss. If the directory does not exist we look
for the environment.yml file in the 'default' environment and finally
for the services.yml file in the config/ directory.

PHPBB3-12620

tests/di/create_container_test.php

@@ -59,6 +59,8 @@ namespace
 
 			// Checks use_extensions
 			$this->assertTrue($container->hasParameter('enabled'));
+			$this->assertTrue($container->hasParameter('enabled_2'));
+			$this->assertTrue($container->hasParameter('enabled_3'));
 			$this->assertFalse($container->hasParameter('disabled'));
 			$this->assertFalse($container->hasParameter('available'));
 
@@ -201,6 +203,8 @@ namespace phpbb\db\driver
 		{
 			return array(
 				array('ext_name' => 'vendor/enabled'),
+				array('ext_name' => 'vendor/enabled-2'),
+				array('ext_name' => 'vendor/enabled-3'),
 			);
 		}
 	}

tests/di/fixtures/ext/vendor/enabled-2/config/production/environment.yml

@@ -0,0 +1,2 @@
+parameters:
+    enabled_2: true

tests/di/fixtures/ext/vendor/enabled-3/config/services.yml

@@ -0,0 +1,2 @@
+parameters:
+    enabled_3: true