[Console][2.3] ApplicationTester - test stdout and stderr#17255

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SpacePossum wants to merge 2 commits intosymfony:2.3from

SpacePossum:2_3_feature_application_tester_diff_between_stdout_and_stderr

Commits on Mar 9, 2016

Add option to capture stderr and stdout separately.
SpacePossum
committed

Commits on Mar 10, 2016

rename property, update error message.
SpacePossum
committed