[FrameworkBundle] Make session save path configurable #3912
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Bug fix: no
Feature addition: yes
Backwards compatibility break: no
Symfony2 tests pass:
Makes it possible to configure the session save path. It still defaults to saving sessions in the kernel cache dir. This might not be appropriate if you want to keep your user sessions after deploying your application.
As promised to @fabpot I will also do a PR on the docs explaining why this might be useful.