[HttpFoundation] Deprecate compatibility with PHP <5.4 sessions#24239

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afurculita wants to merge 3 commits intosymfony:3.4from

AlexanderForks:3.4

Commits on Sep 24, 2017

[HttpFoundation] Deprecate <5.4 session functionality

Alexandru Furculita
authored and
afurculita
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Deprecate SessonHanderProxy
afurculita
committed

Commits on Sep 25, 2017

Remove deprecated classes from phpdoc; revert test changes
afurculita
committed