[HOTFIX] Revert "[SPARK-7092] Update spark scala version to 2.11.6"

This reverts commit a11c8683.

For more information see:
https://issues.apache.org/jira/browse/SPARK-7726

pom.xml

@@ -1799,9 +1799,9 @@
         <property><name>scala-2.11</name></property>
       </activation>
       <properties>
-        <scala.version>2.11.6</scala.version>
+        <scala.version>2.11.2</scala.version>
         <scala.binary.version>2.11</scala.binary.version>
-        <jline.version>2.12.1</jline.version>
+        <jline.version>2.12</jline.version>
         <jline.groupid>jline</jline.groupid>
       </properties>
     </profile>

repl/scala-2.11/src/main/scala/org/apache/spark/repl/SparkIMain.scala

@@ -1129,7 +1129,7 @@ class SparkIMain(@BeanProperty val factory: ScriptEngineFactory, initialSettings
 
     def apply(line: String): Result = debugging(s"""parse("$line")""")  {
       var isIncomplete = false
-      currentRun.parsing.withIncompleteHandler((_, _) => isIncomplete = true) {
+      currentRun.reporting.withIncompleteHandler((_, _) => isIncomplete = true) {
         reporter.reset()
         val trees = newUnitParser(line).parseStats()
         if (reporter.hasErrors) Error