[Issue 6921][pulsar-broker-common] Replaced "Paths.get(...).getParent…

…()", because it's system dependent and uses '\' as path separator on Windows (apache#6992)

Co-authored-by: penghui <penghui@apache.org>

pulsar-broker-common/src/main/java/org/apache/pulsar/broker/cache/ConfigurationCacheService.java

@@ -18,7 +18,6 @@
  */
 package org.apache.pulsar.broker.cache;
 
-import java.nio.file.Paths;
 import java.util.Map;
 
 import org.apache.bookkeeper.util.ZkUtils;
@@ -127,7 +126,8 @@ public FailureDomain deserialize(String path, byte[] content) throws Exception {
 
     private void createFailureDomainRoot(ZooKeeper zk, String path) {
         try {
-            final String clusterZnodePath = Paths.get(path).getParent().toString();
+            final int index = path.lastIndexOf('/');
+            final String clusterZnodePath = (index > 0) ? path.substring(0, index) : null;
             if (zk.exists(clusterZnodePath, false) != null && zk.exists(path, false) == null) {
                 try {
                     byte[] data = "".getBytes();