Updating pom to be 2.9.0-SNAPSHOT instead of 3.0

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-ui/pom.xml

@@ -20,12 +20,12 @@
   <parent>
     <artifactId>hadoop-yarn</artifactId>
     <groupId>org.apache.hadoop</groupId>
-    <version>3.0.0-alpha2-SNAPSHOT</version>
+    <version>2.9.0-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.apache.hadoop</groupId>
   <artifactId>hadoop-yarn-ui</artifactId>
-  <version>3.0.0-alpha2-SNAPSHOT</version>
+  <version>2.9.0-SNAPSHOT</version>
   <name>Apache Hadoop YARN UI</name>
   <packaging>${packaging.type}</packaging>