Some aws implementations, for example the quobyte object storage, do not
support the v4 signing algorithm, but only v1.
This makes it possible to configure the signatureVersion.
The algorithm implementation was ported from d6c1be296e/botocore/auth.py (L860-L862)
which is used by the aws CLI client.
This fixes https://github.com/heptio/ark/issues/811.
Signed-off-by: Bastian Hofmann <bashofmann@gmail.com>
This allows the Ark server to use one URL for the majority of
communications with S3 (or compatible) object storage, and a different
URL base for pre-signed URLs (for streaming logs, etc. to clients).
Signed-off-by: Andy Goldstein <andy.goldstein@gmail.com>
