[WIP] Add RayOnSpark examples (#1420)
[WIP] Add RayOnSpark examples (#1420)

* Create .keep

* update .keep path

* add rl_pong example

* move to rl_pong direction

* remove original file

* add parameter server example

* add license

* PEP8 checks

* PEP8 checks

* Add into integration test

* Wrap tests into bash function

* Update license

* PEP8 checks

* Correct syntax of rl_pong

intel-analytics/BigDL,yangw1234/BigDL,yangw1234/BigDL,yangw1234/BigDL,yangw1234/BigDL,intel-analytics/BigDL,intel-analytics/BigDL,intel-analytics/BigDL