Set Bucket Replication panics with XMinioAdminRemoteTargetNotFoundError

[HJLebbink]

When adding a missing test for set-get-delete bucket replication, I found that set_bucket_replication always panics.

minio-rs/tests/test_bucket_replication.rs

Line 78 in 46bda8f

// TODO panic: called `Result::unwrap()` on an `Err` value: S3Error(ErrorResponse { code: "XMinioAdminRemoteTargetNotFoundError", message: "The remote target does not exist",