Logging: improve formatting to enable fail2ban parsing

Fixes #436

Modifications:
- remove calls to strval() on safe data
- update the date format: 'Y/m/d_H:i:s' => 'Y/m/d H:i:s'

Signed-off-by: VirtualTam <virtualtam@flibidi.net>

tests/UtilsTest.php

@@ -22,7 +22,7 @@ class UtilsTest extends PHPUnit_Framework_TestCase
     protected static $testLogFile = 'tests.log';
 
     // Expected log date format
-    protected static $dateFormat = 'Y/m/d_H:i:s';
+    protected static $dateFormat = 'Y/m/d H:i:s';
     
 
     /**