[HttpKernel] render_esi should behave in dev as it does in prod#15056

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bpaulin wants to merge 2 commits intosymfony:2.7from

bpaulin:strict-render-fragment

Commits on Jun 28, 2015

render_esi behaviour when fallback
bpaulin
committed

Commits on Sep 3, 2015

code style
bpaulin
committed