S3 disable ssl verify

[kkellerlbl]

Add a configuration option (default to false) that disables verification of the S3 SSL certificate (for example, if it is self-signed).

• [x] Add support for s3-disable-ssl-verify flag (default false)
• [x] Have minioClient constructor honor new flag
• [x] Have awscli constructor honor new flag
• [x] Have http.NewRequest honor new flag (will need to add option to NewS3FileStore constructor)
• [ ] Add tests for self-signed cert flag
• [ ] Test against a minio with a self-signed cert in a deploy env
• [ ] Update version, documentation and release notes

[codecov[bot]]

Codecov Report

Merging #131 (3d4ff6f) into s3-disable-ssl-verify (5db1e52) will increase coverage by 0.05%. The diff coverage is 100.00%.

@@                    Coverage Diff                    @@
##           s3-disable-ssl-verify     #131      +/-   ##
=========================================================
+ Coverage                  91.14%   91.20%   +0.05%     
=========================================================
  Files                         14       14              
  Lines                       1412     1421       +9     
=========================================================
+ Hits                        1287     1296       +9     
  Misses                        92       92              
  Partials                      33       33              

Impacted Files	Coverage Δ
config/config.go	100.00% <100.00%> (ø)
filestore/s3.go	90.41% <100.00%> (+0.20%)	:arrow_up:
service/build.go	62.74% <100.00%> (+3.17%)	:arrow_up:

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