Update with new Scamper binary

Merge pull request #22 from m-lab/clean-code

clean old scamper codes and update docker image

remove IP from filename

#18

Make file writing once for all and add client IP to filename

#15

#16

Robustness

Made many errors recoverable.
Added Prometheus monitoring support.

use sc_attach for new connections

#10

Cleanup and add support for sc_attach

fix ss path and go entry point issue

Merge pull request #9 from m-lab/more-docker

fix docker entry point err

first version of scamper caller in golang

up to PR #5