failed to add Minio as a multi-cloud backend

[hecaian]

Issue/Feature Description:
While registering the cloud backend, I selected "AWS S3" as backend cloud type, given the name, region etc...
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after clicked the create button，the following errors are reported by the multi-cloud_api_1 :

api_1 | [2022-01-23T06:55:01Z] [ERROR] [/root/gopath/src/github.com/opensds/multi-cloud/api/pkg/backend/service.go] [backend.(*APIService).CreateBackend():284] [PID:1] failed to create backend due to wrong credentials: {"id":"go.micro.client","code":500,"detail":"RequestError: send request failed\ncaused by: Put "http://sample7299da90-5104-48b5-871b-735f1347628d.192.168.1.122:9000/\": dial tcp: lookup sample7299da90-5104-48b5-871b-735f1347628d.192.168.1.122: no such host","status":"Internal Server Error"}