ZEPPELIN-3278. Avoid duplicated interpreter setting

### What is this PR for?
Straightforward bugfix for ZEPPELIN-3278. Just don't create interpreter setting instance when registering from template.

### What type of PR is it?
[Bug Fix]

### Todos
* [ ] - Task

### What is the Jira issue?
* https://issues.apache.org/jira/browse/ZEPPELIN-3278

### How should this be tested?
* CI pass

### Screenshots (if appropriate)

### Questions:
* Does the licenses files need update? No
* Is there breaking changes for older versions? No
* Does this needs documentation? No

Author: Jeff Zhang <zjffdu@apache.org>

Closes apache#2824 from zjffdu/ZEPPELIN-3278 and squashes the following commits:

6ece9ca [Jeff Zhang] [ZEPPELIN-3278] Avoid duplicated interpreter setting

(cherry picked from commit 21dc20d)
Signed-off-by: Jeff Zhang <zjffdu@apache.org>

zeppelin-zengine/src/main/java/org/apache/zeppelin/interpreter/InterpreterSettingManager.java

@@ -192,13 +192,14 @@ private void initInterpreterSetting(InterpreterSetting interpreterSetting) {
   }
 
   /**
-   * Load interpreter setting from interpreter-setting.json
+   * Load interpreter setting from interpreter.json
    */
   private void loadFromFile() throws IOException {
     InterpreterInfoSaving infoSaving =
         configStorage.loadInterpreterSettings();
     if (infoSaving == null) {
-      // nothing to read
+      // it is fresh zeppelin instance if there's no interpreter.json, just create interpreter
+      // setting from interpreterSettingTemplates
       for (InterpreterSetting interpreterSettingTemplate : interpreterSettingTemplates.values()) {
         InterpreterSetting interpreterSetting = new InterpreterSetting(interpreterSettingTemplate);
         initInterpreterSetting(interpreterSetting);
@@ -403,14 +404,10 @@ private void registerInterpreterSetting(List<RegisteredInterpreter> registeredIn
         .setIntepreterSettingManager(this)
         .create();
 
-    LOGGER.info("Register InterpreterSettingTemplate & Create InterpreterSetting: {}",
+    LOGGER.info("Register InterpreterSettingTemplate: {}",
         interpreterSettingTemplate.getName());
     interpreterSettingTemplates.put(interpreterSettingTemplate.getName(),
         interpreterSettingTemplate);
-
-    InterpreterSetting interpreterSetting = new InterpreterSetting(interpreterSettingTemplate);
-    initInterpreterSetting(interpreterSetting);
-    interpreterSettings.put(interpreterSetting.getName(), interpreterSetting);
   }
 
   @VisibleForTesting