Ability to use REDUCED_REDUNDANCY S3 storage class (fixes #495)

[vania-pooh]

No description provided.

[codecov-io]

Codecov Report

Merging #496 into master will increase coverage by 0.05%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #496      +/-   ##
==========================================
+ Coverage   77.19%   77.25%   +0.05%     
==========================================
  Files          11       11              
  Lines        1285     1288       +3     
==========================================
+ Hits          992      995       +3     
  Misses        232      232              
  Partials       61       61

Flag	Coverage Δ
#unittests	77.25% <100%> (+0.05%)	⬆️

Impacted Files	Coverage Δ
upload/s3.go	86.79% <100%> (+0.79%)	⬆️

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