Add support for non-barrier mode to launch ray (#4014)
Add support for non-barrier mode to launch ray (#4014)

* add support for non-barrier mode

* fix style

* meet review

* meet review

* move barrier mode to zoocontext

* bug fix

* modify

* update
yangw1234/BigDL,yangw1234/BigDL,yangw1234/BigDL,intel-analytics/BigDL,intel-analytics/BigDL,intel-analytics/BigDL,yangw1234/BigDL,intel-analytics/BigDL