clearToken exception is thrown at wrong place.
merged branch xkobal/master (PR #8830)

This PR was submitted for the master branch but it was merged into the 2.2 branch instead (closes #8830).

Discussion
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clearToken exception is thrown at wrong place.

The PR https://github.com/symfony/symfony/pull/8528 has added a problem when logger is enabled.

The log message for clearToken exception throw actually a fatal error because $failed doesn't exist in clearToken method. I have moved the log message to the handle method.

Commits
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701c25b clearToken exception is thrown at wrong place.
updated CHANGELOG for 2.2.6
update CONTRIBUTORS for 2.2.6
updated VERSION for 2.2.6
bumped Symfony version to 2.2.7
Merge branch '2.2' into 2.3

* 2.2:
  bumped Symfony version to 2.2.7
  updated VERSION for 2.2.6
  update CONTRIBUTORS for 2.2.6
  updated CHANGELOG for 2.2.6
  clearToken exception is thrown at wrong place.

Conflicts:
	src/Symfony/Component/HttpKernel/Kernel.php
updated CHANGELOG for 2.3.4
updated VERSION for 2.3.4