Update control cmd USAGE to indicate that it is possible to put access secret keys in URL (#3115)

cmd/control-heal-main.go

@@ -35,7 +35,7 @@ var healCmd = cli.Command{
   minio control {{.Name}} - {{.Usage}}
 
 USAGE:
-  minio control {{.Name}}
+  minio control {{.Name}} http[s]://[access_key[:secret_key]@]server_ip:port/
 
 FLAGS:
   {{range .Flags}}{{.}}

cmd/control-lock-main.go

@@ -52,7 +52,7 @@ var lockCmd = cli.Command{
   minio control {{.Name}} - {{.Usage}}
 
 USAGE:
-  minio control {{.Name}} [list|clear] http://localhost:9000/
+  minio control {{.Name}} [list|clear] http[s]://[access_key[:secret_key]@]server_ip:port/
 
 FLAGS:
   {{range .Flags}}{{.}}

cmd/control-service-main.go

@@ -33,7 +33,7 @@ var serviceCmd = cli.Command{
   minio control {{.Name}} - {{.Usage}}
 
 USAGE:
-  minio control {{.Name}} [status|restart|stop] URL
+  minio control {{.Name}} [status|restart|stop] http[s]://[access_key[:secret_key]@]server_ip:port/
 
 FLAGS:
   {{range .Flags}}{{.}}