fix extrapath in init_k8s_cluster (#6428)
fix extrapath in init_k8s_cluster (#6428)


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