HDDS-2651 Make startId parameter non-mandatory while listing containers through shell command

Author: nilotpalnandi

hadoop-hdds/tools/src/main/java/org/apache/hadoop/hdds/scm/cli/container/ListSubcommand.java

@@ -49,8 +49,8 @@ public class ListSubcommand implements Callable<Void> {
   private ContainerCommands parent;
 
   @Option(names = {"-s", "--start"},
-      description = "Container id to start the iteration", required = true)
-  private long startId = 1;
+      description = "Container id to start the iteration", required = false)
+  private long startId = 0;
 
   @Option(names = {"-c", "--count"},
       description = "Maximum number of containers to list",