Implement cluster-wide in-place updates (#8070)

This PR is a breaking change and also deprecates
`minio update` command, from this release onwards
all users are advised to just use `mc admin update`

cmd/main.go

@@ -116,7 +116,6 @@ func newApp(name string) *cli.App {
 	// Register all commands.
 	registerCommand(serverCmd)
 	registerCommand(gatewayCmd)
-	registerCommand(updateCmd)
 	registerCommand(versionCmd)
 
 	// Set up app.