[DependencyInjection] Improve ParameterNotFoundException when accessing a nested parameter#19584

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wouterj wants to merge 2 commits intosymfony:masterfrom

wouterj:di/parameters-keys-error-experience

Commits on Aug 9, 2016

Extracted test into a data provider
wouterj
committed

Commits on Aug 10, 2016

Added notion and help when trying to access nested parameters
wouterj
committed