HADOOP-15974. Upgrade Curator version to 2.13.0 to fix ZK tests. Contributed by Akira Ajisaka

hadoop-project/pom.xml

@@ -87,7 +87,7 @@
     <protoc.path>${env.HADOOP_PROTOC_PATH}</protoc.path>
 
     <zookeeper.version>3.4.13</zookeeper.version>
-    <curator.version>2.12.0</curator.version>
+    <curator.version>2.13.0</curator.version>
     <findbugs.version>3.0.0</findbugs.version>
     <spotbugs.version>3.1.0-RC1</spotbugs.version>
     <dnsjava.version>2.1.7</dnsjava.version>