HDFS-15499. Clean up httpfs/pom.xml to remove aws-java-sdk-s3 exclusion (#2188)

Signed-off-by: Akira Ajisaka <aajisaka@apache.org>

hadoop-hdfs-project/hadoop-hdfs-httpfs/pom.xml

@@ -118,10 +118,6 @@
           <groupId>org.eclipse.jetty</groupId>
           <artifactId>servlet-api-2.5</artifactId>
         </exclusion>
-        <exclusion>
-          <groupId>com.amazonaws</groupId>
-          <artifactId>aws-java-sdk-s3</artifactId>
-        </exclusion>
         <exclusion>
           <groupId>org.eclipse.jdt</groupId>
           <artifactId>core</artifactId>
@@ -153,10 +149,6 @@
           <groupId>org.eclipse.jetty</groupId>
           <artifactId>servlet-api-2.5</artifactId>
         </exclusion>
-        <exclusion>
-          <groupId>com.amazonaws</groupId>
-          <artifactId>aws-java-sdk-s3</artifactId>
-        </exclusion>
         <exclusion>
           <groupId>org.eclipse.jdt</groupId>
           <artifactId>core</artifactId>