Fix unit test errors.

Author: Sun Rui

core/src/test/scala/org/apache/spark/deploy/SparkSubmitSuite.scala

@@ -246,7 +246,7 @@ class SparkSubmitSuite
       mainClass should be ("org.apache.spark.deploy.Client")
     }
     classpath should have size 0
-    sysProps should have size 8
+    sysProps should have size 9
     sysProps.keys should contain ("SPARK_SUBMIT")
     sysProps.keys should contain ("spark.master")
     sysProps.keys should contain ("spark.app.name")
@@ -255,6 +255,7 @@ class SparkSubmitSuite
     sysProps.keys should contain ("spark.driver.cores")
     sysProps.keys should contain ("spark.driver.supervise")
     sysProps.keys should contain ("spark.shuffle.spill")
+    sysProps.keys should contain ("spark.submit.deployMode")
     sysProps("spark.shuffle.spill") should be ("false")
   }