new features (mostly for testing netmap capabilities)

+ pkt-gen -f rx now remains active even when traffic stops
  Previous behaviour (exit after 1 second of silence) can be
  restored with the -W option

+ the -X option does a hexdump of the content of a packet (both tx and rx).
  This can be useful to check what goes in and out.

+ the -I option instructs the sender to use indirect buffers
  (not really useful other than to test the kernel module in the
  VALE switch)

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