Spark kafka delegation token supported

As we can notice, Kafka is going to support delegation tokenhttps://cwiki-test.apache.org/confluence/display/KAFKA/KIP-48+Delegation+token+support+for+Kafka. Spark need to use the delegation token for Kafka cluster as delegation token for HDFS, Hive and HBase server.

In this Jira, we are going to track how to provide the delegation token for Spark Streaming to read and write data from/to Kafka.