Forwarding now processes forwarding hint on Interests,
and no longer considers the Link object.
refs #4055
Change-Id: I0331687ee8ec31afa2f1a105e903670689647c4d
This commit also adds NetworkRegionTable to store producer region names,
and checks packets are well-formed before entering forwarding pipelines.
refs #3034, #3155
Change-Id: I8de4c482e8a289b922be70139675bc4661f9a301