[eZPublishLegacyBundle] refactored the LegacyResponseManager to move some code into the LegacyResponse class where it is more appropriate.
[EzPublishLegacyBundle] renamed LegacyResponse::setHeaders() to LegacyResponse::setLegacyHeaders()
Merge pull request #741 from hhamon/refactoring_legacy_response_manager

EZP-22370: [eZPublishLegacyBundle] refactored the LegacyResponseManager