YARN-10037. Upgrade build tools for YARN Web UI v2.

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-ui/README.md

@@ -37,7 +37,7 @@ All the following commands must be run inside `src/main/webapp`.
 
 You will need the following things properly installed on your computer.
 
-* Install [Yarn](https://yarnpkg.com) v0.21.3
+* Install [Yarn](https://yarnpkg.com) v1.21.1
 * Install [Bower](http://bower.io/) v1.8.8
 * Install all dependencies by running `yarn install` & `bower install`
 

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

@@ -185,8 +185,8 @@
                   <goal>install-node-and-yarn</goal>
                 </goals>
                 <configuration>
-                  <nodeVersion>v5.12.0</nodeVersion>
-                  <yarnVersion>v0.21.3</yarnVersion>
+                  <nodeVersion>v8.17.0</nodeVersion>
+                  <yarnVersion>v1.21.1</yarnVersion>
                 </configuration>
               </execution>
               <execution>