Use dual stack endpoints for S3

[dmage]

No description provided.

[adambkaplan]

/lgtm

Note we'll need BZs to backport to 4.3 - we're using AWS to test IPv6 clusters.

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: adambkaplan, dmage

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[dmage]

This closed the bug 1788581.

/cherrypick release-4.3

[openshift-cherrypick-robot]

@dmage: #425 failed to apply on top of branch "release-4.3":

error: Failed to merge in the changes.
Using index info to reconstruct a base tree...
M	pkg/storage/s3/s3.go
Falling back to patching base and 3-way merge...
Auto-merging pkg/storage/s3/s3.go
CONFLICT (content): Merge conflict in pkg/storage/s3/s3.go
Patch failed at 0001 Use dual stack endpoints for S3

In response to this:

This closed the bug 1788581.

/cherrypick release-4.3

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