HBASE-8604 improve reporting of incorrect peer address in replication

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1575459 13f79535-47bb-0310-9956-ffa450edef68

hbase-client/src/main/java/org/apache/hadoop/hbase/zookeeper/ZKUtil.java

@@ -399,7 +399,7 @@ public class ZKUtil {
   public static String[] transformClusterKey(String key) throws IOException {
     String[] parts = key.split(":");
     if (parts.length != 3) {
-      throw new IOException("Cluster key invalid, the format should be:" +
+      throw new IOException("Cluster key passed " + key + " is invalid, the format should be:" +
           HConstants.ZOOKEEPER_QUORUM + ":hbase.zookeeper.client.port:"
           + HConstants.ZOOKEEPER_ZNODE_PARENT);
     }