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

This reverts commit a4356bb7a5bf2fdf41bbced45968416e8ed945e6.

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/log/LogLevel.java

@@ -27,7 +27,6 @@ import java.util.regex.Pattern;
 
 import javax.net.ssl.HttpsURLConnection;
 import javax.net.ssl.SSLSocketFactory;
-import javax.servlet.ServletContext;
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;