zeppelin git commit: [ZEPPELIN-2211] Too many WARN logs: "Couldn't get interpreter editor setting"

[fe...@apache.org]

Repository: zeppelin
Updated Branches:
  refs/heads/master 15641d098 -> 78e2e912b


[ZEPPELIN-2211] Too many WARN logs: "Couldn't get interpreter editor setting"

### What is this PR for?

every time we insert invalid backend magic (e.g `sparc`), `InterpreterSettingManager` throws WARN log.

I changed the log level to debug because

- WARN level should not be used for this kind of situation.
- This log doesn't provide any useful information for user.  So info level is not proper as well.

I attached a screenshot.

### What type of PR is it?
[Improvement]

### Todos

NONE

### What is the Jira issue?

[ZEPPELIN-2211](https://issues.apache.org/jira/browse/ZEPPELIN-2211)

### How should this be tested?

- Insert invalid magic in your paragraph. For example `sparc` or `marcdown`

### Screenshots (if appropriate)

![interpreter_setting_manager](https://cloud.githubusercontent.com/assets/4968473/24235266/cbecbbf4-0fdf-11e7-9fcc-f1a95a5e82ab.gif)

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

Author: 1ambda <1a...@gmail.com>

Closes #2179 from 1ambda/ZEPPELIN-2211/change-log-level-ISM-NPE and squashes the following commits:

e333c1c [1ambda] fix: Change log level to debug from warn


Project: http://git-wip-us.apache.org/repos/asf/zeppelin/repo
Commit: http://git-wip-us.apache.org/repos/asf/zeppelin/commit/78e2e912
Tree: http://git-wip-us.apache.org/repos/asf/zeppelin/tree/78e2e912
Diff: http://git-wip-us.apache.org/repos/asf/zeppelin/diff/78e2e912

Branch: refs/heads/master
Commit: 78e2e912b6f9014e9a83c929cde339dcb8459bdc
Parents: 15641d0
Author: 1ambda <1a...@gmail.com>
Authored: Thu Mar 23 15:39:39 2017 +0900
Committer: Felix Cheung <fe...@apache.org>
Committed: Sun Mar 26 12:34:37 2017 -0700

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 .../apache/zeppelin/interpreter/InterpreterSettingManager.java    | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
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http://git-wip-us.apache.org/repos/asf/zeppelin/blob/78e2e912/zeppelin-zengine/src/main/java/org/apache/zeppelin/interpreter/InterpreterSettingManager.java
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diff --git a/zeppelin-zengine/src/main/java/org/apache/zeppelin/interpreter/InterpreterSettingManager.java b/zeppelin-zengine/src/main/java/org/apache/zeppelin/interpreter/InterpreterSettingManager.java
index 32db89b..f031591 100644
--- a/zeppelin-zengine/src/main/java/org/apache/zeppelin/interpreter/InterpreterSettingManager.java
+++ b/zeppelin-zengine/src/main/java/org/apache/zeppelin/interpreter/InterpreterSettingManager.java
@@ -514,7 +514,8 @@ public class InterpreterSettingManager {
         }
       }
     } catch (NullPointerException e) {
-      logger.warn("Couldn't get interpreter editor setting");
+      // Use `debug` level because this log occurs frequently
+      logger.debug("Couldn't get interpreter editor setting");
     }
     return editor;
   }