Strategy::PropagateNewInterest

= strategy_callout(CCNST_FIRST)
UDP multicast on all NICs

This does not work well.
On linux, a message sent to multicast group is received by other faces on the same group but different NIC.
On FreeBSD, only the first UdpSingleMcastChannel can bind to a port number,
 other channels report Address In Use.
don't auto-listen on UDP-NDNLP and UDP-multicast

Ethernet: pcap filter filters out frames from local machine (FreeBSD will loop them back)