Revert "HDFS-15620. RBF: Fix test failures after HADOOP-17281 (#2375)"

This reverts commit 263b7d5dfc.

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

@@ -114,11 +114,6 @@ https://maven.apache.org/xsd/maven-4.0.0.xsd">
       <artifactId>mockito-core</artifactId>
       <scope>test</scope>
     </dependency>
-    <dependency>
-      <groupId>org.assertj</groupId>
-      <artifactId>assertj-core</artifactId>
-      <scope>test</scope>
-    </dependency>
   </dependencies>
 
   <build>

hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/fs/contract/router/web/TestRouterWebHDFSContractRootDirectory.java

@@ -71,9 +71,4 @@ public void testRmRootRecursive() {
   public void testRmEmptyRootDirRecursive() {
     // It doesn't apply because we still have the mount points here
   }
-
-  @Override
-  public void testSimpleRootListing() {
-    // It doesn't apply because DFSRouter dosn't support LISTSTATUS_BATCH.
-  }
 }