YARN-6131. FairScheduler: Lower update interval for faster tests. (kasha)

(cherry picked from commit 11e44bdda74b3357714f4b11a66f703d64c0f14f)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/ParameterizedSchedulerTestBase.java

@@ -87,6 +87,7 @@ public abstract class ParameterizedSchedulerTestBase {
 
     conf.set(YarnConfiguration.RM_SCHEDULER, FairScheduler.class.getName());
     conf.set(FairSchedulerConfiguration.ALLOCATION_FILE, FS_ALLOC_FILE);
+    conf.setLong(FairSchedulerConfiguration.UPDATE_INTERVAL_MS, 10);
   }
 
   public SchedulerType getSchedulerType() {

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FairSchedulerTestBase.java

@@ -88,6 +88,7 @@ public class FairSchedulerTestBase {
         1024);
     conf.setInt(YarnConfiguration.RM_SCHEDULER_MAXIMUM_ALLOCATION_MB, 10240);
     conf.setBoolean(FairSchedulerConfiguration.ASSIGN_MULTIPLE, false);
+    conf.setLong(FairSchedulerConfiguration.UPDATE_INTERVAL_MS, 10);
     conf.setFloat(FairSchedulerConfiguration.PREEMPTION_THRESHOLD, 0f);
 
     conf.setFloat(