Revert "HADOOP-13707. Skip authorization for anonymous user to access Hadoop"

This reverts commit 7993fb5b8127a219e6c936206b5c5c0790e82946.

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics/MetricsServlet.java

@@ -25,7 +25,6 @@ import java.util.List;
 import java.util.Map;
 import java.util.TreeMap;
 
-import javax.servlet.ServletContext;
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
@@ -110,13 +109,8 @@ public class MetricsServlet extends HttpServlet {
   public void doGet(HttpServletRequest request, HttpServletResponse response)
       throws ServletException, IOException {
 
-    // If user is a static user and auth Type is null, that means
-    // there is a non-security environment and no need authorization,
-    // otherwise, do the authorization.
-    final ServletContext servletContext = getServletContext();
-    if (!HttpServer2.isStaticUserAndNoneAuthType(servletContext, request) &&
-        !HttpServer2.isInstrumentationAccessAllowed(servletContext,
-            request, response)) {
+    if (!HttpServer2.isInstrumentationAccessAllowed(getServletContext(),
+                                                   request, response)) {
       return;
     }