Resource pools api

[fireboy1919]

What is this PR for?

This is a step towards creating a REST endpoint from resource pools https://issues.apache.org/jira/browse/ZEPPELIN-699

It allows resources to be downloaded from results using a REST API

What type of PR is it?

Improvement

Todos

• - Add ability to download resources via an API endpoint

What is the Jira issue?

Finishes: https://issues.apache.org/jira/browse/ZEPPELIN-699

Note, that this pull request is based upon these:
#782
#816

How should this be tested?

1. Edit an interpreter
2. Add a new property to the interpreter - the "ResourcePoolClass" - and assign it to "org.apache.zeppelin.resource.VFSResourcePool"
3. Run the interpreter

You should see new resource files created in notebook/zeppelin_resources

Then go to
/api/notebook/results
to see the rest endpoint that lists all of the results.

View it with
/api/notebook/[noteid]/paragraph/[paragraph id]/results

Screenshots (if appropriate)

Questions:

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

[srinivas-startsmartlabs]

The api to view paragraph result is:

/api/notebook/[noteid]/paragraph/[paragraph id]/result

It was incorrectly mentioned as:

/api/notebook/[noteid]/paragraph/[paragraph id]/results

[felixcheung]

How are we on this? @Leemoonsoo would you like to take a look?