ISSUE #224: listing logs should exclude <default>

Descriptions of the changes in this PR:

exclude `<default>` from listing logs

(the tests are covered by #227)

Author: Sijie Guo <sijie@apache.org>

Reviewers: Jia Zhai <None>

This closes #229 from sijie/fix_listing_log_pr, closes #224

distributedlog-core/src/main/java/org/apache/distributedlog/util/DLUtils.java

@@ -279,7 +279,7 @@ public static String normalizeClientId(String clientId) {
      * @return true if it is reserved name, otherwise false.
      */
     public static boolean isReservedStreamName(String name) {
-        return name.startsWith(".");
+        return name.startsWith(".") || name.startsWith("<");
     }
 
     /**