Merge branch '2.8' into 3.0

* 2.8:
  fixed CS
  fixed CS
  tweaked default CS fixer config
  [HttpKernel] Dont close the output stream in debug
  move HttpKernel component to require section
  Fixed oci and sqlsrv merge queries when emulation is disabled - fixes #17284
  [Session] fix PDO transaction aborted under PostgreSQL
  [Console] Use InputInterface inherited doc as possible
  Mention generating absolute urls in UPGRADE files and CHANGELOG
  add docblock type elements to support newly added IteratorAggregate::getIterator PhpStorm support
  FormBuilderInterface: fix getForm() return type.
  Fixed typo in PHPDoc

Author: fabpot

Kernel.php

@@ -134,6 +134,14 @@ public function terminate(Request $request, Response $response)
         }
 
         if ($this->getHttpKernel() instanceof TerminableInterface) {
+            if (!$this->debug) {
+                if (function_exists('fastcgi_finish_request')) {
+                    fastcgi_finish_request();
+                } elseif ('cli' !== PHP_SAPI) {
+                    Response::closeOutputBuffers(0, true);
+                }
+            }
+
             $this->getHttpKernel()->terminate($request, $response);
         }
     }