[ZEPPELIN-1038] Add Solr interpreter

[mosuka]

What is this PR for?

Solr 6.1.0 that supports the SQL has been released. I propose to add interpreter to Zeppelin.
It is a PR for facilitate the visualization and analysis of the index in Solr with Zeppelin.

What type of PR is it?

Feature

Todos

• - PR
• - Unit-test
• - Document

What is the Jira issue?

https://issues.apache.org/jira/browse/ZEPPELIN-1038

How should this be tested?

Added unit-tests, also manual testing with sample data.

$ mvn clean test -pl zeppelin-interpreter -pl solr
[INFO] Scanning for projects...

[...]

-------------------------------------------------------
 T E S T S
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Running org.apache.zeppelin.solr.SolrSqlInterpreterTest
Creating dataDir: /private/var/folders/99/p369dv7n5sqdl9rdvyx0vqzr0000gn/T/org.apache.zeppelin.solr.SolrSqlInterpreterTest_589C7DC8E23A0BDC-001/init-core-data-001
log4j:WARN No appenders could be found for logger (org.eclipse.jetty.util.log).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Jun 21, 2016 9:36:10 AM com.carrotsearch.randomizedtesting.ThreadLeakControl checkThreadLeaks
WARNING: Will linger awaiting termination of 1 leaked thread(s).
Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 13.744 sec - in org.apache.zeppelin.solr.SolrSqlInterpreterTest

Results :

Tests run: 2, Failures: 0, Errors: 0, Skipped: 0

[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] Zeppelin: Interpreter .............................. SUCCESS [02:31 min]
[INFO] Zeppelin: Solr interpreter ......................... SUCCESS [ 19.532 s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 02:51 min
[INFO] Finished at: 2016-06-21T09:36:11+09:00
[INFO] Final Memory: 57M/578M
[INFO] ------------------------------------------------------------------------

Screenshots (if appropriate)

Questions:

• Does this needs more detailed documention?

[mosuka]

Interpreter to use the JDBC driver looks to be integrated into the JDBC Interpreter.
Close this issue.