bug symfony#20577 [FrameworkBundle] Mark cache.default_*_provider services private (nicolas-grekas)

This PR was merged into the 3.1 branch.

Discussion
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[FrameworkBundle] Mark cache.default_*_provider services private

| Q             | A
| ------------- | ---
| Branch?       | 3.1
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | symfony#20563
| License       | MIT
| Doc PR        | -

I know making a service private has a potential for breaking BC. Yet, these services should not be used directly in controllers/userland code, and I really doubt anyone did. Let's make it private now and fix linked issue (even if it's a false positive from SymfonyServiceDefinitionValidator, it shows we have this service that really isn't meant to be public).

Commits
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09adfda [FrameworkBundle] Mark cache.default_*_provider services private

Author: fabpot

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

@@ -1045,6 +1045,7 @@ private function registerCacheConfiguration(array $config, ContainerBuilder $con
         foreach (array('doctrine', 'psr6', 'redis') as $name) {
             if (isset($config[$name = 'default_'.$name.'_provider'])) {
                 $container->setAlias('cache.'.$name, Compiler\CachePoolPass::getServiceProvider($container, $config[$name]));
+                $container->getAlias('cache.'.$name)->setPublic(false);
             }
         }
         foreach (array('app', 'system') as $name) {