[SPARK-24637][SS] Add metrics regarding state and watermark to dropwizard metrics#21622

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HeartSaVioR wants to merge 2 commits intoapache:masterfrom

HeartSaVioR:SPARK-24637

Commits on Jun 23, 2018

SPARK-24637 Add metrics regarding state and watermark to dropwizard metrics
HeartSaVioR
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Commits on Jun 26, 2018

Address minor review comment
HeartSaVioR
committed