Update net/scamper to 20141211a. From maintainer in PR pkg/50138.

>From https://rommie.caida.org/pipermail/scamper-announce/2015-August/000003.html

* provide the ability for scamper's control socket to bind to a
  specific address.  this allows external systems to contact and drive
  scamper processes.  a more secure solution will follow in a month or
  two.

* when converting the source port of a control socket client to a
  string, print it in host byte order rather than network byte order

* add a TBT (too-big-trick) option to ping, use it in sc_speedtrap.  a
  simple optimisation to send up to M packets to get N fragmented
  responses.

* if an input list to sc_speedtrap contains the same IP address twice,
  ignore the duplicate address, rather than crash later.

* use a quicksort with a 3-way partition.  will make scamper more
  efficient in many places.

* add sc_warts2csv for samknows

* fix sc_tracediff so that it doesn't crash if the two warts files
  being compared traceroute to different sets of addresses.  reported
  by Job Snijders.


(bsiegert)