reload appId and attemptId when AM is new

Author: XuTingjun

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

@@ -49,6 +49,8 @@ class Checkpoint(@transient ssc: StreamingContext, val checkpointTime: Time)
     // Reload properties for the checkpoint application since user wants to set a reload property
     // or spark had changed its value and user wants to set it back.
     val propertiesToReload = List(
+      "spark.yarn.app.id",
+      "spark.yarn.app.attemptId",
       "spark.driver.host",
       "spark.driver.port",
       "spark.master",