[SPARK-8533] [STREAMING] Upgrade Flume to 1.6.0

Author: Hari Shreedharan <[email protected]>

Closes apache#6939 from harishreedharan/upgrade-flume-1.6.0 and squashes the following commits:

94b80ae [Hari Shreedharan] [SPARK-8533][Streaming] Upgrade Flume to 1.6.0

Author: harishreedharan

pom.xml

@@ -128,7 +128,7 @@
     <yarn.version>${hadoop.version}</yarn.version>
     <hbase.version>0.98.7-hadoop2</hbase.version>
     <hbase.artifact>hbase</hbase.artifact>
-    <flume.version>1.4.0</flume.version>
+    <flume.version>1.6.0</flume.version>
     <zookeeper.version>3.4.5</zookeeper.version>
     <curator.version>2.4.0</curator.version>
     <hive.group>org.spark-project.hive</hive.group>