upgrade spark to 2.2.0 #8
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Mainly,
KafkaSourceOffsetserialization doesn't work any more,so I do it modeled after
spark-sql-kafka-010by hand,and keep the same interface
map[TopicAndPartition, LeaderOffset].Some function like
parseVersionis private underorg.apache.spark.sql,so I move the package namespace.
Spark supports the serialization version, and default VERSION is 1 under
kafka-010.I decrease to 0 in our package, just FYI.
Should fix #7.