Extensions to the netmap framework - Week 8

[Stefano Duo]

Hi,

during this week i finished writing the netmap test suite.
Each test begins with a comment explaining the objective of the test, and
how that objective is tested.
Tests involving packets exchanges accept command line arguments to specify
the length of the packets being sent, the filler character and the number
of packets.
Moreover i wrote randomized_tests, a main script which runs every test
script with randomized cli arguments, so that we can find values that cause
problems faster.
Finally i added a new target to run the entire test suite has been added to
the utils Makefile.

Project wiki:
https://wiki.freebsd.org/SummerOfCode2018Projects/ExtensionsToNetmap
SVN repository: https://svnweb.freebsd.org/socsvn/soc2018/sduo/

Stefano.