Merge branch '2.8' into 3.2

* 2.8:
  [2.8] Prevent double registrations related to tag priorities
  Prevent double registrations related to tag priorities

Author: fabpot

Tests/DependencyInjection/Compiler/PropertyInfoPassTest.php

@@ -20,9 +20,9 @@ class PropertyInfoPassTest extends TestCase
     public function testServicesAreOrderedAccordingToPriority()
     {
         $services = array(
-            'n3' => array('tag' => array()),
-            'n1' => array('tag' => array('priority' => 200)),
-            'n2' => array('tag' => array('priority' => 100)),
+            'n3' => array(array()),
+            'n1' => array(array('priority' => 200)),
+            'n2' => array(array('priority' => 100)),
         );
 
         $expected = array(

Tests/DependencyInjection/Compiler/SerializerPassTest.php

@@ -72,9 +72,9 @@ public function testThrowExceptionWhenNoEncoders()
     public function testServicesAreOrderedAccordingToPriority()
     {
         $services = array(
-            'n3' => array('tag' => array()),
-            'n1' => array('tag' => array('priority' => 200)),
-            'n2' => array('tag' => array('priority' => 100)),
+            'n3' => array(array()),
+            'n1' => array(array('priority' => 200)),
+            'n2' => array(array('priority' => 100)),
         );
 
         $expected = array(