AMBARI-7173. API retruns filed "display_name" = null, for Zookeeper Client (aonishuk)

ambari-server/src/main/resources/stacks/HDP/2.0.6/services/ZOOKEEPER/metainfo.xml

@@ -39,6 +39,7 @@
 
         <component>
           <name>ZOOKEEPER_CLIENT</name>
+          <displayName>ZooKeeper Client</displayName>
           <category>CLIENT</category>
           <cardinality>1+</cardinality>
           <commandScript>