[SPARK-4381][Streaming]Add warning log when user set spark.master to local in...

[SPARK-4381][Streaming]Add warning log when user set spark.master to local in Spark Streaming and there's no job executed

Author: jerryshao <saisai.shao@intel.com>

Closes #3244 from jerryshao/SPARK-4381 and squashes the following commits:

d2486c7 [jerryshao] Improve the warning log
d726e85 [jerryshao] Add local[1] to the filter condition
eca428b [jerryshao] Add warning log

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

@@ -121,6 +121,11 @@ class StreamingContext private[streaming] (
     }
   }
 
+  if (sc.conf.get("spark.master") == "local" || sc.conf.get("spark.master") == "local[1]") {
+    logWarning("spark.master should be set as local[n], n > 1 in local mode if you have receivers" +
+      " to get data, otherwise Spark jobs will not get resources to process the received data.")
+  }
+
   private[streaming] val conf = sc.conf
 
   private[streaming] val env = SparkEnv.get