Allow transparent usage of s3 interfaces using s3v2 signature_version #86
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Added a config variable "signature_version" that is set through trying an s3v4 signature first, then falls back to s3v2 through excepting on a ClientError if s3v4 isn't accepted by the s3 interface.
This is required for transparently allowing users to connect to S3 interfaces that cannot be updated to use the s3v4 signature_version.