[SPARK-15841][Tests] REPLSuite has incorrect env set for a couple of tests.

Description from JIRA.
In ReplSuite, for a test that can be tested well on just local should not really have to start a local-cluster. And similarly a test is in-sufficiently run if it's actually fixing a problem related to a distributed run in environment with local run.

Existing tests.

Author: Prashant Sharma <prashsh1@in.ibm.com>

Closes #13574 from ScrapCodes/SPARK-15841/repl-suite-fix.

repl/scala-2.10/src/test/scala/org/apache/spark/repl/ReplSuite.scala

@@ -233,7 +233,7 @@ class ReplSuite extends SparkFunSuite {
   }
 
   test("SPARK-1199 two instances of same class don't type check.") {
-    val output = runInterpreter("local-cluster[1,1,1024]",
+    val output = runInterpreter("local",
       """
         |case class Sum(exp: String, exp2: String)
         |val a = Sum("A", "B")
@@ -305,7 +305,7 @@ class ReplSuite extends SparkFunSuite {
   }
 
   test("SPARK-2632 importing a method from non serializable class and not using it.") {
-    val output = runInterpreter("local",
+    val output = runInterpreter("local-cluster[1,1,1024]",
     """
       |class TestClass() { def testMethod = 3 }
       |val t = new TestClass

repl/scala-2.11/src/test/scala/org/apache/spark/repl/ReplSuite.scala

@@ -276,7 +276,7 @@ class ReplSuite extends SparkFunSuite {
   }
 
   test("SPARK-1199 two instances of same class don't type check.") {
-    val output = runInterpreter("local-cluster[1,1,1024]",
+    val output = runInterpreter("local",
       """
         |case class Sum(exp: String, exp2: String)
         |val a = Sum("A", "B")
@@ -336,7 +336,7 @@ class ReplSuite extends SparkFunSuite {
   }
 
   test("SPARK-2632 importing a method from non serializable class and not using it.") {
-    val output = runInterpreter("local",
+    val output = runInterpreter("local-cluster[1,1,1024]",
       """
       |class TestClass() { def testMethod = 3 }
       |val t = new TestClass