Enforce to use correct node and npm version in new YARN-UI build

qunit-notifications#0.1.1 bower_components/qunit-notifications
[INFO] 
[INFO] --- exec-maven-plugin:1.3.1:exec (ember build) @ hadoop-yarn-ui ---

/testptch/hadoop/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-ui/target/src/main/webapp/node_modules/merge-trees/index.js:33
class MergeTrees {
^^^^^
Unexpected reserved word
SyntaxError: Unexpected reserved word
    at Module._compile (module.js:439:25)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.require (module.js:364:17)
    at require (module.js:380:17)
    at Object.<anonymous> (/testptch/hadoop/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-ui/target/src/main/webapp/node_modules/broccoli-merge-trees/index.js:2:18)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)