[SPARK-8025][Streaming]Add JavaDoc style deprecation for deprecated Streaming methods

Scala `deprecated` annotation actually doesn't show up in JavaDoc.

Author: zsxwing <zsxwing@gmail.com>

Closes #6564 from zsxwing/SPARK-8025 and squashes the following commits:

2faa2bb [zsxwing] Add JavaDoc style deprecation for deprecated Streaming methods

streaming/src/main/scala/org/apache/spark/streaming/StreamingContext.scala

@@ -271,6 +271,8 @@ class StreamingContext private[streaming] (
    * Create an input stream with any arbitrary user implemented receiver.
    * Find more details at: http://spark.apache.org/docs/latest/streaming-custom-receivers.html
    * @param receiver Custom implementation of Receiver
+   *
+   * @deprecated As of 1.0.0", replaced by `receiverStream`.
    */
   @deprecated("Use receiverStream", "1.0.0")
   def networkStream[T: ClassTag](receiver: Receiver[T]): ReceiverInputDStream[T] = {
@@ -617,6 +619,8 @@ class StreamingContext private[streaming] (
    * Wait for the execution to stop. Any exceptions that occurs during the execution
    * will be thrown in this thread.
    * @param timeout time to wait in milliseconds
+   *
+   * @deprecated As of 1.3.0, replaced by `awaitTerminationOrTimeout(Long)`.
    */
   @deprecated("Use awaitTerminationOrTimeout(Long) instead", "1.3.0")
   def awaitTermination(timeout: Long) {
@@ -741,6 +745,10 @@ object StreamingContext extends Logging {
     }
   }
 
+  /**
+   * @deprecated As of 1.3.0, replaced by implicit functions in the DStream companion object.
+   *             This is kept here only for backward compatibility.
+   */
   @deprecated("Replaced by implicit functions in the DStream companion object. This is " +
     "kept here only for backward compatibility.", "1.3.0")
   def toPairDStreamFunctions[K, V](stream: DStream[(K, V)])

streaming/src/main/scala/org/apache/spark/streaming/api/java/JavaStreamingContext.scala

@@ -148,6 +148,9 @@ class JavaStreamingContext(val ssc: StreamingContext) extends Closeable {
   /** The underlying SparkContext */
   val sparkContext = new JavaSparkContext(ssc.sc)
 
+  /**
+   * @deprecated As of 0.9.0, replaced by `sparkContext`
+   */
   @deprecated("use sparkContext", "0.9.0")
   val sc: JavaSparkContext = sparkContext
 
@@ -619,6 +622,7 @@ class JavaStreamingContext(val ssc: StreamingContext) extends Closeable {
    * Wait for the execution to stop. Any exceptions that occurs during the execution
    * will be thrown in this thread.
    * @param timeout time to wait in milliseconds
+   * @deprecated As of 1.3.0, replaced by `awaitTerminationOrTimeout(Long)`.
    */
   @deprecated("Use awaitTerminationOrTimeout(Long) instead", "1.3.0")
   def awaitTermination(timeout: Long): Unit = {
@@ -677,6 +681,7 @@ object JavaStreamingContext {
    *
    * @param checkpointPath Checkpoint directory used in an earlier JavaStreamingContext program
    * @param factory        JavaStreamingContextFactory object to create a new JavaStreamingContext
+   * @deprecated As of 1.4.0, replaced by `getOrCreate` without JavaStreamingContextFactor.
    */
   @deprecated("use getOrCreate without JavaStreamingContextFactor", "1.4.0")
   def getOrCreate(
@@ -699,6 +704,7 @@ object JavaStreamingContext {
    * @param factory        JavaStreamingContextFactory object to create a new JavaStreamingContext
    * @param hadoopConf     Hadoop configuration if necessary for reading from any HDFS compatible
    *                       file system
+   * @deprecated As of 1.4.0, replaced by `getOrCreate` without JavaStreamingContextFactor.
    */
   @deprecated("use getOrCreate without JavaStreamingContextFactory", "1.4.0")
   def getOrCreate(
@@ -724,6 +730,7 @@ object JavaStreamingContext {
    *                       file system
    * @param createOnError  Whether to create a new JavaStreamingContext if there is an
    *                       error in reading checkpoint data.
+   * @deprecated As of 1.4.0, replaced by `getOrCreate` without JavaStreamingContextFactor.
    */
   @deprecated("use getOrCreate without JavaStreamingContextFactory", "1.4.0")
   def getOrCreate(

streaming/src/main/scala/org/apache/spark/streaming/dstream/DStream.scala

@@ -603,6 +603,8 @@ abstract class DStream[T: ClassTag] (
   /**
    * Apply a function to each RDD in this DStream. This is an output operator, so
    * 'this' DStream will be registered as an output stream and therefore materialized.
+   *
+   * @deprecated As of 0.9.0, replaced by `foreachRDD`.
    */
   @deprecated("use foreachRDD", "0.9.0")
   def foreach(foreachFunc: RDD[T] => Unit): Unit = ssc.withScope {
@@ -612,6 +614,8 @@ abstract class DStream[T: ClassTag] (
   /**
    * Apply a function to each RDD in this DStream. This is an output operator, so
    * 'this' DStream will be registered as an output stream and therefore materialized.
+   *
+   * @deprecated As of 0.9.0, replaced by `foreachRDD`.
    */
   @deprecated("use foreachRDD", "0.9.0")
   def foreach(foreachFunc: (RDD[T], Time) => Unit): Unit = ssc.withScope {