Unmark *some* Aiokafkaconsumer thread tests

[wbarnha]

Hopefully this will help us investigate #166.

[codecov-commenter]

Codecov Report

Base: 93.42% // Head: 94.37% // Increases project coverage by +0.95% 🎉

Coverage data is based on head (f5c7abb) compared to base (fda5c40).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #377      +/-   ##
==========================================
+ Coverage   93.42%   94.37%   +0.95%     
==========================================
  Files         102      102              
  Lines       11023    11023              
  Branches     1293     1293              
==========================================
+ Hits        10298    10403     +105     
+ Misses        646      540     -106     
- Partials       79       80       +1     

Impacted Files	Coverage Δ
faust/transport/drivers/aiokafka.py	74.10% <0.00%> (+15.62%)	⬆️

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[wbarnha]

Lots of woes here related to opentracing, which is now deprecated: opentracing/specification#163

[wbarnha]

After further investigation, there's a lot that needs to be done for fixing opentracing usage. I think the move for now is to merge this as-is and then migrate opentracing usage over to opentelemetry as documented in https://opentelemetry-python.readthedocs.io/en/stable/shim/opentracing_shim/opentracing_shim.html.