SPARK-1584: Upgrade Flume dependency to 1.4.0

Updated the Flume dependency in the maven pom file and the scala build file.

Author: tmalaska <ted.malaska@cloudera.com>

Closes #507 from tmalaska/master and squashes the following commits:

79492c8 [tmalaska] excluded all thrift
159c3f1 [tmalaska] fixed the flume pom file issues
5bf56a7 [tmalaska] Upgrade flume version

external/flume/pom.xml

@@ -61,12 +61,16 @@
     <dependency>
       <groupId>org.apache.flume</groupId>
       <artifactId>flume-ng-sdk</artifactId>
-      <version>1.2.0</version>
+      <version>1.4.0</version>
       <exclusions>
         <exclusion>
           <groupId>org.jboss.netty</groupId>
           <artifactId>netty</artifactId>
         </exclusion>
+        <exclusion>
+          <groupId>org.apache.thrift</groupId>
+          <artifactId>libthrift</artifactId>
+        </exclusion>
       </exclusions>
     </dependency>
     <dependency>

project/SparkBuild.scala

@@ -313,6 +313,7 @@ object SparkBuild extends Build {
   val excludeCurator = ExclusionRule(organization = "org.apache.curator")
   val excludePowermock = ExclusionRule(organization = "org.powermock")
   val excludeFastutil = ExclusionRule(organization = "it.unimi.dsi")
+  val excludeThrift = ExclusionRule(organization = "org.apache.thrift")
 
   def sparkPreviousArtifact(id: String, organization: String = "org.apache.spark",
       version: String = "0.9.0-incubating", crossVersion: String = "2.10"): Option[sbt.ModuleID] = {
@@ -607,7 +608,7 @@ object SparkBuild extends Build {
     name := "spark-streaming-flume",
     previousArtifact := sparkPreviousArtifact("spark-streaming-flume"),
     libraryDependencies ++= Seq(
-      "org.apache.flume" % "flume-ng-sdk" % "1.2.0" % "compile" excludeAll(excludeNetty)
+      "org.apache.flume" % "flume-ng-sdk" % "1.4.0" % "compile" excludeAll(excludeNetty, excludeThrift)
     )
   )