Merge branch '2.7' into 2.8

* 2.7:
  Added 'default' color
  [HttpFoundation] Reload the session after regenerating its id
  [HttpFoundation] Add a test case to confirm a bug in session migration
  [Serializer] Fix ClassMetadata::sleep()
  [2.6] Static Code Analysis for Components and Bundles
  [Finder] Command::addAtIndex() fails with Command instance argument
  [DependencyInjection] Freeze also FrozenParameterBag::remove
  [Twig][Bridge] replaced `extends` with `use` in bootstrap_3_horizontal_layout.html.twig
  fix CS
  fixed CS
  Add a way to reset the singleton
  [Security] allow to use `method` in XML configs
  [Serializer] Fix Groups tests.
  Remove duplicate example
  Remove var not used due to returning early (introduced in 8982c32)
  [Serializer] Fix Groups PHPDoc
  Enhance hhvm test skip message
  fix for legacy asset() with EmptyVersionStrategy
  [Form] Added upgrade notes for #15061

Author: fabpot

DependencyInjection/MainConfiguration.php

@@ -162,6 +162,7 @@ private function addAccessControlSection(ArrayNodeDefinition $rootNode)
                     ->cannotBeOverwritten()
                     ->prototype('array')
                         ->fixXmlConfig('ip')
+                        ->fixXmlConfig('method')
                         ->children()
                             ->scalarNode('requires_channel')->defaultNull()->end()
                             ->scalarNode('path')
@@ -300,7 +301,7 @@ private function addFirewallsSection(ArrayNodeDefinition $rootNode, array $facto
                     })
                 ->end()
                 ->children()
-                    ->scalarNode('secret')->defaultValue(uniqid())->end()
+                    ->scalarNode('secret')->defaultValue(uniqid('', true))->end()
                 ->end()
             ->end()
             ->arrayNode('switch_user')

DependencyInjection/Security/UserProvider/InMemoryFactory.php

@@ -54,7 +54,7 @@ public function addConfiguration(NodeDefinition $node)
                     ->useAttributeAsKey('name')
                     ->prototype('array')
                         ->children()
-                            ->scalarNode('password')->defaultValue(uniqid())->end()
+                            ->scalarNode('password')->defaultValue(uniqid('', true))->end()
                             ->arrayNode('roles')
                                 ->beforeNormalization()->ifString()->then(function ($v) { return preg_split('/\s*,\s*/', $v); })->end()
                                 ->prototype('scalar')->end()