[SPARK-7820] [BUILD] Fix Java8-tests suite compile and test error under sbt

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

Closes #7120 from jerryshao/SPARK-7820 and squashes the following commits:

6902439 [jerryshao] fix Java8-tests suite compile error under sbt

extras/java8-tests/pom.xml

@@ -39,6 +39,13 @@
       <artifactId>spark-core_${scala.binary.version}</artifactId>
       <version>${project.version}</version>
     </dependency>
+    <dependency>
+      <groupId>org.apache.spark</groupId>
+      <artifactId>spark-core_${scala.binary.version}</artifactId>
+      <version>${project.version}</version>
+      <type>test-jar</type>
+      <scope>test</scope>
+    </dependency>
     <dependency>
       <groupId>org.apache.spark</groupId>
       <artifactId>spark-streaming_${scala.binary.version}</artifactId>
@@ -49,6 +56,7 @@
       <artifactId>spark-streaming_${scala.binary.version}</artifactId>
       <version>${project.version}</version>
       <type>test-jar</type>
+      <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>junit</groupId>

project/SparkBuild.scala

@@ -161,7 +161,7 @@ object SparkBuild extends PomBuild {
   // Note ordering of these settings matter.
   /* Enable shared settings on all projects */
   (allProjects ++ optionallyEnabledProjects ++ assemblyProjects ++ Seq(spark, tools))
-    .foreach(enable(sharedSettings ++ ExludedDependencies.settings ++ Revolver.settings))
+    .foreach(enable(sharedSettings ++ ExcludedDependencies.settings ++ Revolver.settings))
 
   /* Enable tests settings for all projects except examples, assembly and tools */
   (allProjects ++ optionallyEnabledProjects).foreach(enable(TestSettings.settings))
@@ -246,7 +246,7 @@ object Flume {
   This excludes library dependencies in sbt, which are specified in maven but are
   not needed by sbt build.
   */
-object ExludedDependencies {
+object ExcludedDependencies {
   lazy val settings = Seq(
     libraryDependencies ~= { libs => libs.filterNot(_.name == "groovy-all") }
   )