GetBucketLocation: Use vhost signature in case of v2 signature #1810
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The existing code always picks a path style signature when
v2 mode is selected. Reviewing the history shows little information
why it is done that way.
A previous recent commit, 24cdd7f,
though it seems correct, broke existing deployments that use GCS
(e.g. minio/mc#4547)
We should not sign v2 with path style when the endpoint is vhost.
This commit is tested with MinIO/AWS/GCS when v2 is enabled.