feature #10534 [SwiftMailer] [MonologBundle] send error log mails from CLI (arodiss)

This PR was merged into the 2.5-dev branch.

Discussion
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[SwiftMailer] [MonologBundle] send error log mails from CLI

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| License       | MIT

Given I have symfony2 application with Monolog configured to send mail on error logs.
When I have exception thrown from CLI task
Then I should receive error mail

However this is not true because `Monolog/SwiftMailerHandler` is doing force flush only on `kernel.terminate`, but not on `console.terminate`

This PR fixes issue together with https://github.com/symfony/MonologBundle/pull/73

Commits
-------

9bb602f added explicit swiftmailer flush after ConsoleEvents::TERMINATE

src/Symfony/Bridge/Monolog/Handler/SwiftMailerHandler.php

@@ -12,6 +12,7 @@
 namespace Symfony\Bridge\Monolog\Handler;
 
 use Monolog\Handler\SwiftMailerHandler as BaseSwiftMailerHandler;
+use Symfony\Component\Console\Event\ConsoleTerminateEvent;
 use Symfony\Component\HttpKernel\Event\PostResponseEvent;
 
 /**
@@ -43,6 +44,16 @@ class SwiftMailerHandler extends BaseSwiftMailerHandler
         $this->instantFlush = true;
     }
 
+    /**
+     * After the CLI application has been terminated we will always flush messages
+     *
+     * @param ConsoleTerminateEvent $event
+     */
+    public function onCliTerminate(ConsoleTerminateEvent $event)
+    {
+        $this->instantFlush = true;
+    }
+
     /**
      * {@inheritdoc}
      */