[ZEPPELIN-2434] Credential feature does work in JDBC interpreter #2269
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What is this PR for?
Credential feature does not work in JDBC interpreter.
This PR fixes unittest that does not detect this bug and fix jdbc interpreter to correctly read credential.
What type of PR is it?
Bug Fix
Todos
What is the Jira issue?
https://issues.apache.org/jira/browse/ZEPPELIN-2434
How should this be tested?
Set empty
default.user
property and set id/pw in 'credential' menu. And try use jdbc interpreter.Questions: