Replicate integration tests infrastructure for all Kernels

[lresende]

Enable basic integration tests for all supported kernels using docker

[kevin-bates]

Moving to backlog. We'll reassign this during a sprint that can accommodate.

[LK-Tmac1]

FYI: seems there are already some notebooks inside JKG for testing, although most of them are very simple.

A sample test ipynb file:
https://github.com/SparkTC/elyra/blob/master/elyra/tests/resources/kernel_api2.ipynb

Code that uses the ipynb file:
https://github.com/SparkTC/elyra/blob/master/elyra/tests/test_notebook_http.py#L21

[kevin-bates]

@liukun1016 - Please modify the R notebooks to be more generic like the other notebooks. Right now it contains BigData University content. Ideally, each notebook would essentially make the same calls so that comparisons could be made. Thanks!

[LK-Tmac1]

The PR #245 was merged. Now close this issue.