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

    web interface in non-secure environment.  (Yuanbo Liu via eyang)

    (cherry picked from commit dc308e98b9f8f7458a28a015515876ddea5666f2)
    With Addendum patch

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

@@ -27,6 +27,7 @@ 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;