ns3/utils/pktconv keep up with new ndnSIM API

ndnSIM has major changes on ns3::ndn::Name and Interest, ContentObject classes, which breaks NDNFD's ns-3 integration badly.
All ns-3 related features are disabled, and will be re-enabled gradually.

ndnSIM has some support for CcnbWireProtocol, but NackMessage is encoded differently, and ContentObjectMessage is incompatible with libccn. Only InterestMessage convertion can be delegated to ndnSIM's CCNB wire.