Node: In NdndIdFetcher, in onData, should get a const pointer to the signature.
Node: In NdndIdFetcher, in onData, should get a const pointer to the signature.

cawka/packaging-ndn-cpp-dev,cawka/packaging-ndn-cpp-dev,cawka/packaging-ndn-cpp-dev,cawka/packaging-ndn-cpp-dev