feature symfony#26218 [MonologBridge] Allow to change level format in ConsoleFormatter (ostrolucky)

This PR was merged into the 4.1-dev branch.

Discussion
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[MonologBridge] Allow to change level format in ConsoleFormatter

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

I want to use this format `%datetime% <comment>[%level_name%]</comment> %start_tag%%message%%end_tag%`, but ConsoleFormatter formats in a way message looks like this:

![screenshot from 2018-02-19 01-54-21](https://user-images.githubusercontent.com/496233/36359102-d6c20e4c-1517-11e8-9988-8a49efc4cacb.png)

As you see, unnecessary padding looks like anomaly here and there is currently no way to remove it without making own formatter.

This option allows me to replace default padding format with `%s`.

Commits
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fbd257c [MonologBridge] Allow to change level format

Author: fabpot

src/Symfony/Bridge/Monolog/Formatter/ConsoleFormatter.php

@@ -60,6 +60,7 @@ public function __construct(array $options = array())
             'date_format' => self::SIMPLE_DATE,
             'colors' => true,
             'multiline' => false,
+            'level_name_format' => '%-9s',
         ), $options);
 
         if (class_exists(VarCloner::class)) {
@@ -119,7 +120,7 @@ public function format(array $record)
         $formatted = strtr($this->options['format'], array(
             '%datetime%' => $record['datetime']->format($this->options['date_format']),
             '%start_tag%' => sprintf('<%s>', $levelColor),
-            '%level_name%' => sprintf('%-9s', $record['level_name']),
+            '%level_name%' => sprintf($this->options['level_name_format'], $record['level_name']),
             '%end_tag%' => '</>',
             '%channel%' => $record['channel'],
             '%message%' => $this->replacePlaceHolder($record)['message'],