BR: confused wrong region error

[cyliu0]

Please answer these questions before submitting your issue. Thanks!

1. What did you do? If possible, provide a recipe for reproducing the error. br restore from an non-exist region on S3

2. What did you expect to see? incorrect region error info

3. What did you see instead? Error: Bucket tools-uw2 is not accessible: MissingEndpoint: 'Endpoint' configuration is required for this service

This error info is from S3 service. But users might think if --s3.endpoint is required.

4. What version of BR and TiDB/TiKV/PD are you using?

$ ./bin/br -V
Release Version: v5.0.0-master
Git Commit Hash: fa66494bcf9395016b7847fecddd7e83478af27a
Git Branch: master
Go Version: go1.16.2
UTC Build Time: 2021-03-28 02:36:16
Race Enabled: false

5. Operation logs

   • Please upload br.log for BR if possible
   • Please upload tidb-lightning.log for TiDB-Lightning if possible
   • Please upload tikv-importer.log from TiKV-Importer if possible
   • Other interesting logs

6. Configuration of the cluster and the task

   • tidb-lightning.toml for TiDB-Lightning if possible
   • tikv-importer.toml for TiKV-Importer if possible
   • topology.yml if deployed by TiUP

7. Screenshot/exported-PDF of Grafana dashboard or metrics' graph in Prometheus if possible

[cyliu0]

/label severity/minor

[ti-chi-bot]

@cyliu0: The label(s) severity/minor cannot be applied. These labels are supported: Hacktoberfest, duplicate, good first issue, invalid, needs-cherry-pick-3.1, needs-cherry-pick-4.0, needs-cherry-pick-5.0, needs-cherry-pick-5.0-rc, question, release-blocker, wontfix.

In response to this:

/label severity/minor

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