merged branch snc/issue-1798-sf21 (PR #2598)
merged branch snc/issue-1798-sf21 (PR #2598)

Commits
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4d80ebd Remove security token if user was deleted, is disabled or locked to prevent infinite redirect loops to the login path (fixes #1798).

Discussion
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[2.1] Fix for issue 1798

Bug fix: yes
Feature addition: no
Backwards compatibility break: no
Symfony2 tests pass: yes
Fixes the following tickets: #1798

This is a simplified PR of #2528 for the master branch.

showpad/Symfony-Security,symfony/Security