[HttpClient] Add support for NTLM authentication

Author: nicolas-grekas

DependencyInjection/Configuration.php

@@ -1414,6 +1414,9 @@ private function addHttpClientSection(ArrayNodeDefinition $rootNode)
                                     ->scalarNode('auth_bearer')
                                         ->info('A token enabling HTTP Bearer authorization.')
                                     ->end()
+                                    ->scalarNode('auth_ntlm')
+                                        ->info('A "username:password" pair to use Microsoft NTLM authentication (requires the cURL extension).')
+                                    ->end()
                                     ->arrayNode('query')
                                         ->info('Associative array of query string values merged with the base URI.')
                                         ->useAttributeAsKey('key')