ZOOKEEPER-3904: Remove duplicate check in ContainerManager#getCandidates method

Author: Technoboy- <technoboy@yeah.net>

Reviewers: Reviewers: maoling <maoling199210191@sina.com>

Closes #1419 from Technoboy-/dev2

zookeeper-server/src/main/java/org/apache/zookeeper/server/ContainerManager.java

@@ -181,9 +181,6 @@ public class ContainerManager {
                     }
                 }
             }
-            if ((node != null) && (node.stat.getCversion() > 0) && (node.getChildren().isEmpty())) {
-                candidates.add(containerPath);
-            }
         }
         for (String ttlPath : zkDb.getDataTree().getTtls()) {
             DataNode node = zkDb.getDataTree().getNode(ttlPath);