blob: Add iotest.ReaderTest to blob's drivertest suite

[vangent]

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[codecov]

Codecov Report

Merging #3144 (4c0453a) into master (d82d114) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3144      +/-   ##
==========================================
+ Coverage   72.42%   72.43%   +0.01%     
==========================================
  Files         112      112              
  Lines       14286    14286              
==========================================
+ Hits        10346    10348       +2     
+ Misses       3226     3224       -2     
  Partials      714      714              

Impacted Files	Coverage Δ
blob/s3blob/s3blob.go	90.12% <100.00%> (+0.27%)	⬆️

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