CDAP-67 Lower log levels for LiveStreamFileReader
Merge pull request #669 from caskdata/feature/quiet-stream-logs

CDAP-67 Lower log levels for LiveStreamFileReader
Spark Integration: Collect system metrics from Spark
Spark Integration: Added support for getting spark metrics from RunTimeStats
Spark Integration: Spark metrics unit test
Fix MetricsRequestParserTest by changing service id to u