YARN-4973. YarnWebParams next.fresh.interval should be next.refresh.interval (templedf via rkanter)

(cherry picked from commit 5ffd4b7c1e1f3168483c708c7ed307a565389eb2)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/webapp/YarnWebParams.java

@@ -40,5 +40,5 @@ public interface YarnWebParams {
   String NODE_STATE = "node.state";
   String NODE_LABEL = "node.label";
   String WEB_UI_TYPE = "web.ui.type";
-  String NEXT_REFRESH_INTERVAL = "next.fresh.interval";
+  String NEXT_REFRESH_INTERVAL = "next.refresh.interval";
 }