AMBARI-13676. Unit tests are consistently failing on builds.apache.org (aonishuk)

ambari-metrics/ambari-metrics-timelineservice/src/test/java/org/apache/hadoop/yarn/server/applicationhistoryservice/metrics/timeline/TestClusterSuite.java

@@ -18,13 +18,11 @@
 package org.apache.hadoop.yarn.server.applicationhistoryservice.metrics.timeline;
 
 
-import org.junit.Ignore;
 import org.junit.runner.RunWith;
 import org.junit.runners.Suite;
 
 import static org.junit.runners.Suite.SuiteClasses;
 
-@Ignore
 @RunWith(Suite.class)
 @SuiteClasses({ITMetricAggregator.class, ITClusterAggregator.class, ITPhoenixHBaseAccessor.class})
 public class TestClusterSuite {