Merge remote-tracking branch 'upstream/master'

conf/metrics.properties.template

core/src/main/scala/org/apache/spark/CacheManager.scala

core/src/main/scala/org/apache/spark/SparkContext.scala

core/src/main/scala/org/apache/spark/TaskContext.scala

core/src/main/scala/org/apache/spark/executor/Executor.scala

...main/scala/org/apache/spark/executor/ExecutorSource.scala

...c/main/scala/org/apache/spark/metrics/MetricsConfig.scala

...ain/scala/org/apache/spark/metrics/sink/GangliaSink.scala

.../scala/org/apache/spark/metrics/sink/MetricsServlet.scala

.../main/scala/org/apache/spark/scheduler/DAGScheduler.scala

...scala/org/apache/spark/scheduler/DAGSchedulerSource.scala

...rc/main/scala/org/apache/spark/scheduler/ResultTask.scala

...ain/scala/org/apache/spark/scheduler/ShuffleMapTask.scala

...n/scala/org/apache/spark/storage/BlockManagerSource.scala

...rc/main/scala/org/apache/spark/storage/StorageLevel.scala

core/src/test/scala/org/apache/spark/CacheManagerSuite.scala

core/src/test/scala/org/apache/spark/JavaAPISuite.java

...est/scala/org/apache/spark/deploy/JsonProtocolSuite.scala

...t/scala/org/apache/spark/metrics/MetricsConfigSuite.scala

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