MAPREDUCE-6738. TestJobListCache.testAddExisting failed intermittently in slow VM testbed. Contributed by Junping Du.

(cherry picked from commit ecff7d03595b45d7a5d6aed73b9931fef85a56ee)
(cherry picked from commit f4d94f2246da3a015a105cb7f55ec1ebc451e0e7)

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/test/java/org/apache/hadoop/mapreduce/v2/hs/TestJobListCache.java

@@ -31,7 +31,7 @@ import static org.junit.Assert.*;
 
 public class TestJobListCache {
 
-  @Test (timeout = 1000)
+  @Test (timeout = 5000)
   public void testAddExisting() {
     JobListCache cache = new JobListCache(2, 1000);