[SPARK-17628][Streaming][Examples] change name "StreamingExamples" to be "StreamingExamplesUtils", more descriptive

[keypointt]

https://issues.apache.org/jira/browse/SPARK-17628

What changes were proposed in this pull request?

object StreamingExamples is more of a utility object, and the name is too general. here changing it to be StreamingExamplesUtils

/** Utility functions for Spark Streaming examples. */
object StreamingExamples extends Logging {

  /** Set reasonable logging levels for streaming if the user has not configured log4j. */
  def setStreamingLogLevels() {
    val log4jInitialized = Logger.getRootLogger.getAllAppenders.hasMoreElements
    if (!log4jInitialized) {
      // We first log something to initialize Spark's default logging, then we override the
      // logging level.
      logInfo("Setting log level to [WARN] for streaming example." +
        " To override add a custom log4j.properties to the classpath.")
      Logger.getRootLogger.setLevel(Level.WARN)
    }
  }
}

How was this patch tested?

Tested manually on local laptop

[SparkQA]

Test build #65748 has finished for PR 15191 at commit 79533fd.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[srowen]

"Foobars" is a common name in Java / Scala for "static methods related to Foobar objects". I think the current name is fine. It's not really an API anyway, just a component of an example.

[keypointt]

oh I see...sorry...I'll close this one