Github user Leemoonsoo commented on the issue:
https://github.com/apache/zeppelin/pull/1100
Tested and overall working well. Found two (minor) problems
When i login from Credential page, list not refreshed after logged in

"Edit" -> "Save" -> "Cancel" -> "Cancel" does not update actual credential
in the backend. However, it displays modified value in frontend, until page is
refreshed.

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