fix retries after exception normalization

[thehesiod]

No description provided.

[codecov]

Codecov Report

Merging #989 (e037c13) into master (8d9d71a) will increase coverage by 1.75%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #989      +/-   ##
==========================================
+ Coverage   85.11%   86.86%   +1.75%     
==========================================
  Files          50       55       +5     
  Lines        4602     5391     +789     
==========================================
+ Hits         3917     4683     +766     
- Misses        685      708      +23     

Flag	Coverage Δ
unittests	86.86% <100.00%> (+1.75%)	⬆️

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Impacted Files	Coverage Δ
aiobotocore/utils.py	76.66% <ø> (-0.18%)	⬇️
tests/boto_tests/test_utils.py	95.19% <ø> (ø)
tests/python3.8/boto_tests/test_utils.py	99.28% <100.00%> (-0.01%)	⬇️
aiobotocore/_helpers.py	50.00% <0.00%> (ø)
tests/test_eventstreams.py	100.00% <0.00%> (ø)
tests/boto_tests/test_credentials.py	97.24% <0.00%> (ø)
tests/boto_tests/test_signers.py	100.00% <0.00%> (ø)
tests/test_basic_s3.py	86.22% <0.00%> (+0.27%)	⬆️

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