Declare dependency to Zookeeper in zookeeper-api-*.ivy (#1926)

Adds dependency to Zookeeper in the ivy file in zookeeper-api module.
diff --git a/zookeeper-api/zookeeper-api-1.0.3-SNAPSHOT.ivy b/zookeeper-api/zookeeper-api-1.0.3-SNAPSHOT.ivy
index 499d5a0..4095e93 100644
--- a/zookeeper-api/zookeeper-api-1.0.3-SNAPSHOT.ivy
+++ b/zookeeper-api/zookeeper-api-1.0.3-SNAPSHOT.ivy
@@ -43,6 +43,7 @@
     <dependency org="org.slf4j" name="slf4j-log4j12" rev="1.7.14" force="true" conf="compile->compile(*),master(*);runtime->runtime(*)">
         <artifact name="slf4j-log4j12" ext="jar"/>
     </dependency>
+    <dependency org="org.apache.zookeeper" name="zookeeper" rev="3.4.13" conf="compile->compile(default);runtime->runtime(default);default->default"/>
 		<dependency org="com.fasterxml.jackson.core" name="jackson-databind" rev="2.11.0" force="true" conf="compile->compile(*),master(*);runtime->runtime(*)"/>
 		<dependency org="com.fasterxml.jackson.core" name="jackson-core" rev="2.11.0" force="true" conf="compile->compile(*),master(*);runtime->runtime(*)"/>
 		<dependency org="org.codehaus.jackson" name="jackson-mapper-asl" rev="1.9.13" force="true" conf="compile->compile(*),master(*);runtime->runtime(*)"/>