multiple simultaneous job submissions against k8s backend cause driver pods to hang

User is reporting that multiple "simultaneous" (or rapidly in succession) job submissions against the k8s back-end are causing driver pods to hang in "Waiting: PodInitializing" state. They filed an associated question at [stackoverflow|https://stackoverflow.com/questions/51843212/spark-driver-pod-stuck-in-waiting-podinitializing-state-in-kubernetes].