Make names pytest-friendly

[sangjinhan]

In pytest, which is compatible with unittest.py that we currently use, names with Test... and test_... have special meanings. This PR renames such names to avoid interference.

[codecov]

Codecov Report

Merging #520 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #520      +/-   ##
==========================================
- Coverage   64.97%   64.96%   -0.01%     
==========================================
  Files         198      198              
  Lines       12246    12246              
==========================================
- Hits         7957     7956       -1     
- Misses       4289     4290       +1

Impacted Files	Coverage Δ
bessctl/test_samples.py	89.74% <100%> (ø)	⬆️
pybess/test_bess.py	100% <100%> (ø)	⬆️
bessctl/test_sugar.py	97.05% <100%> (ø)	⬆️
core/drivers/unix_socket.cc	85.04% <0%> (-0.94%)	⬇️
core/modules/queue.cc	60.9% <0%> (-0.91%)	⬇️
core/modules/flowgen.cc	74.07% <0%> (+0.37%)	⬆️

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[justinemarie]

LGTM (although does anyone else just hate how pep8 adds absurd amounts of spacing around comments?)

[sangjinhan]

selfcat

[justinemarie]

HEY NO!
I was spending all that time looking for a photo of my family's cat!!

[justinemarie]

I am sorry to make you feel like you had to find your own cat :(