DRILL-8460: upgrade zookeeper jar to 3.7.2

Author: pjfanning

pom.xml

@@ -58,7 +58,7 @@
     <janino.version>3.1.8</janino.version>
     <sqlline.version>1.12.0</sqlline.version>
     <jackson.version>2.14.3</jackson.version>
-    <zookeeper.version>3.5.7</zookeeper.version>
+    <zookeeper.version>3.7.2</zookeeper.version>
     <kerby.version>1.0.0</kerby.version>
     <findbugs.version>3.0.5</findbugs.version>
     <netty.tcnative.classifier />