[DependencyInjection] added a way to reference dynamic environment variables in service definitions#16403

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fabpot wants to merge 2 commits intosymfony:2.8from

fabpot:env-parameters

Commits on Nov 11, 2015

[DependencyInjection] added a way to reference dynamic environment variables in service definitions
fabpot
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Commits on Nov 12, 2015

[DependencyInjection] protect environment variables stored in parameters
fabpot
committed