[HttpFoundation] NativeSessionStorage `regenerate` method wrongly sets storage as started#15799

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iambrosi wants to merge 3 commits intosymfony:2.3from

iambrosi:fix-session-regeneration

Commits on Sep 14, 2015

Commits on Sep 22, 2015

Fix check for active sessions in PHP >= 5.4
iambrosi
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