Support init_spark_on_yarn and RayContext (#1344)
Support init_spark_on_yarn and RayContext (#1344)

* rayrunner

* add a jvm killer

* disable killer from spark job and rely on jvm killer only

* add env and verify the cv2 installation

* enhance

* minor

* style

* comments

* local and enhancement

* better local strategy

* doc and style

* doc

* style

* revert

* doc

* disable

* comments

* fix test

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