HDDS-1235. BaseHttpServer NPE is HTTP policy is HTTPS_ONLY. Contributed by Xiaoyu Yao.

Closes #572

(cherry picked from commit 11db46956c6062a986caf9009d3e36049e5830d4)

hadoop-hdds/framework/src/main/java/org/apache/hadoop/hdds/server/BaseHttpServer.java

@@ -65,14 +65,10 @@ public abstract class BaseHttpServer {
   public BaseHttpServer(Configuration conf, String name) throws IOException {
     this.name = name;
     this.conf = conf;
+    policy = DFSUtil.getHttpPolicy(conf);
     if (isEnabled()) {
-      policy = DFSUtil.getHttpPolicy(conf);
-      if (policy.isHttpEnabled()) {
-        this.httpAddress = getHttpBindAddress();
-      }
-      if (policy.isHttpsEnabled()) {
-        this.httpsAddress = getHttpsBindAddress();
-      }
+      this.httpAddress = getHttpBindAddress();
+      this.httpsAddress = getHttpsBindAddress();
       HttpServer2.Builder builder = null;
       builder = DFSUtil.httpServerTemplateForNNAndJN(conf, this.httpAddress,
           this.httpsAddress, name, getSpnegoPrincipal(), getKeytabFile());