bug symfony#18730 [FrameworkBundle] prevent calling get() for service_container service (xabbuh)

This PR was merged into the 2.7 branch.

Discussion
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[FrameworkBundle] prevent calling get() for service_container service

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

This change will simply fix the tests once symfony#18728 gets merged. An alternative approach would be to compile the container so that the code would still work even for services that have been set directly using `set()`. However, compiling the container in a descriptor imo is an unexpected side effect which I tried to avoid here.

Commits
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2d46bd4 prevent calling get() for service_container service

Author: fabpot

src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/Descriptor.php

@@ -274,6 +274,10 @@ protected function resolveServiceDefinition(ContainerBuilder $builder, $serviceI
             return $builder->getAlias($serviceId);
         }
 
+        if ('service_container' === $serviceId) {
+            return $builder;
+        }
+
         // the service has been injected in some special way, just return the service
         return $builder->get($serviceId);
     }