YARN-5138. fix "no findbugs output file" error for hadoop-yarn-server-timelineservice-hbase-tests. (Vrushali C via gtcarrera9)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase-tests/pom.xml

@@ -361,6 +361,13 @@
 
   <build>
     <plugins>
+      <plugin>
+        <groupId>org.codehaus.mojo</groupId>
+        <artifactId>findbugs-maven-plugin</artifactId>
+         <configuration>
+          <includeTests>true</includeTests>
+        </configuration>
+      </plugin>
       <plugin>
         <artifactId>maven-jar-plugin</artifactId>
         <executions>