[SPARK-8743] [Streaming]: Deregister Codahale metrics for streaming when StreamingContext is closed#7362

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nssalian:branch-SPARK-8743

Commits on Jul 13, 2015

Added registerSource to start() and removeSource to stop(). Wrote a test to check the registration and de-registration
Neelesh Srinivas Salian
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Changed the ordering of the imports to classify scala and spark imports
Neelesh Srinivas Salian
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Removed redundancy in imports
Neelesh Srinivas Salian
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Corrected Ordering of imports
Neelesh Srinivas Salian
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moved import org.apache.spark{} to correct place
Neelesh Srinivas Salian
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Moved the scalatest.{} import
Neelesh Srinivas Salian
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Removed the Thread.sleep() call
Neelesh Srinivas Salian
committed