more warning whitelisting

[tardyp]

some warning whitelisting that may fix CI

[codecov]

Codecov Report

Merging #6287 (50d94b9) into master (50e71e3) will decrease coverage by 0.12%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #6287      +/-   ##
==========================================
- Coverage   91.92%   91.80%   -0.13%     
==========================================
  Files         334      334              
  Lines       37542    37542              
==========================================
- Hits        34511    34464      -47     
- Misses       3031     3078      +47     

Impacted Files	Coverage Δ
master/buildbot/steps/transfer.py	96.79% <100.00%> (ø)
master/buildbot/__init__.py	76.92% <0.00%> (-15.39%)	⬇️
worker/buildbot_worker/__init__.py	77.61% <0.00%> (-14.93%)	⬇️
master/buildbot/util/queue.py	90.69% <0.00%> (-6.98%)	⬇️
master/buildbot/db/test_results.py	89.54% <0.00%> (-6.54%)	⬇️
master/buildbot/db/enginestrategy.py	69.10% <0.00%> (-6.51%)	⬇️
master/buildbot/db/connector.py	96.51% <0.00%> (-3.49%)	⬇️

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