YARN-5316 fix hadoop-aws pom not to do the exclusion (Sangjin Li via Vrushali C)

hadoop-tools/hadoop-aws/pom.xml

@@ -250,14 +250,6 @@
       <artifactId>hadoop-yarn-server-tests</artifactId>
       <scope>test</scope>
       <type>test-jar</type>
-      <exclusions>
-        <!-- server-tests brings in an older version of joda-time via
-        timeline service -->
-        <exclusion>
-          <groupId>joda-time</groupId>
-          <artifactId>joda-time</artifactId>
-        </exclusion>
-      </exclusions>
     </dependency>
     <dependency>
       <groupId>org.apache.hadoop</groupId>