update aws sdk: permit to work with s3 compliant storage with sigv4

[hightoxicity]

AWS GO SDK update to be able to store images on openio-sds, swift3 (s3 compliants) storages.

[GordonTheTurtle]

Please sign your commits following these rules:
https://github.com/moby/moby/blob/master/CONTRIBUTING.md#sign-your-work
The easiest way to do this is to amend the last commit:

$ git clone -b "feat-update-aws-sdk-go" git@github.com:hightoxicity/distribution.git somewhere
$ cd somewhere
$ git commit --amend -s --no-edit
$ git push -f

Amending updates the existing PR. You DO NOT need to open a new one.

[stevvooe]

@hightoxicity Make sure to format your commit message correctly. It looks like the subject line and sign off have been switched around some how.

[codecov]

Codecov Report

Merging #2563 into master will decrease coverage by 9.66%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master   #2563      +/-   ##
=========================================
- Coverage   60.87%   51.2%   -9.67%     
=========================================
  Files         129     129              
  Lines       11876   11876              
=========================================
- Hits         7229    6081    -1148     
- Misses       3744    5032    +1288     
+ Partials      903     763     -140

Impacted Files	Coverage Δ
registry/storage/driver/gcs/gcs.go	0.39% <0%> (-68.67%)	⬇️
registry/storage/driver/oss/oss.go	0.56% <0%> (-56.91%)	⬇️
registry/storage/driver/s3-goamz/s3.go	0.5% <0%> (-51.14%)	⬇️
registry/storage/driver/s3-aws/s3.go	4.15% <0%> (-50.98%)	⬇️
registry/client/transport/transport.go	69.69% <0%> (-9.1%)	⬇️

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[dmp42]

Superseded by #2678