Decouple ServiceUpdate to ServerUpdate to be more native (#8138)

The change now is to ensure that we take custom URL as
well for updating the deployment, this is required for
hotfix deliveries for certain deployments - other than
the community release.

This commit changes the previous work d65a2c6725
with newer set of requirements.

Also deprecates PeerUptime()

pkg/madmin/examples/service-status.go

@@ -1,44 +0,0 @@
-// +build ignore
-
-/*
- * MinIO Cloud Storage, (C) 2016 MinIO, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- */
-
-package main
-
-import (
-	"log"
-
-	"github.com/minio/minio/pkg/madmin"
-)
-
-func main() {
-	// Note: YOUR-ACCESSKEYID, YOUR-SECRETACCESSKEY and my-bucketname are
-	// dummy values, please replace them with original values.
-
-	// API requests are secure (HTTPS) if secure=true and insecure (HTTP) otherwise.
-	// New returns an MinIO Admin client object.
-	madmClnt, err := madmin.New("your-minio.example.com:9000", "YOUR-ACCESSKEYID", "YOUR-SECRETACCESSKEY", true)
-	if err != nil {
-		log.Fatalln(err)
-	}
-
-	st, err := madmClnt.ServiceStatus()
-	if err != nil {
-		log.Fatalln(err)
-	}
-	log.Println(st)
-}