[ZEPPELIN-5493] Remove prefix in jdbc interpreter

[huage1994]

What is this PR for?

Currently, zeppelin allow user to run multiple kinds of sql in one interpreter, e.g.

%jdbc(db=mysql)
%jdbc(db=hive){code}

  But this would make jdbc interpreter very complicated, and hard to maintain.   This PR is to proposal to remove this feature, so that user need to create separated interpreter for each database.

%mysql
%hive

What type of PR is it?

Refactoring

Todos

• [ ] - Task

What is the Jira issue?

• Open an issue on Jira ZEPPELIN-5493

How should this be tested?

CI passed

Screenshots (if appropriate)

Questions:

• Does the licenses files need to update? No
• Is there breaking changes for older versions? No
• Does this needs documentation? No

[jongyoul]

BTW, don't it have a doc as well?

[huage1994]

BTW, don't it have a doc as well?

Thanks @jongyoul for reminding!
I found the hive related doc still have usage of this feature. I'll update it and verify.

[huage1994]

BTW, don't it have a doc as well?

Thanks @jongyoul for reminding! I found the hive related doc still have usage of this feature. I'll update it and verify.

Finished.

[zjffdu]

LGTM, will merge if no more comment

[huage1994]

Hi @jongyoul , thanks a lot for your review! Is there any code I need to change? Merging can be performed automatically once the requested changes are addressed. It seems that change requested state can only be addressed by reviewer.