Disable delegation on alluxio-site.properties.template
Disable delegation on alluxio-site.properties.template

As https://github.com/Alluxio/alluxio/pull/3451 discussed, we should disable the delegation. In addition, I got a timeout issue when running MapReduce with the use of delegation.

```Java
INFO mapreduce.Job: Task Id : attempt_1465596856169_0003_m_000147_0, Status : FAILED
Error: java.io.IOException: java.util.concurrent.TimeoutException: Timeout waiting for task.
  at alluxio.client.netty.NettyUnderFileSystemFileWriter.write(NettyUnderFileSystemFileWriter.java:103)
  at alluxio.client.file.UnderFileSystemFileOutStream.writeToWorker(UnderFileSystemFileOutStream.java:161)
  at alluxio.client.file.UnderFileSystemFileOutStream.flush(UnderFileSystemFileOutStream.java:85)
  at alluxio.client.file.UnderFileSystemFileOutStream.close(UnderFileSystemFileOutStream.java:75)
  at alluxio.client.file.FileOutStream.close(FileOutStream.java:157)
  at org.apache.hadoop.fs.FSDataOutputStream$PositionCache.close(FSDataOutputStream.java:72)
  at org.apache.hadoop.fs.FSDataOutputStream.close(FSDataOutputStream.java:106)
  at org.apache.hadoop.io.SequenceFile$Writer.close(SequenceFile.java:1349)
  at org.apache.hadoop.mapred.SequenceFileOutputFormat$1.close(SequenceFileOutputFormat.java:79)
  at org.apache.hadoop.mapred.MapTask$DirectMapOutputCollector.close(MapTask.java:844)
  at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:465)
  at org.apache.hadoop.mapred.MapTask.run(MapTask.java:343)
  at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:164)
  at java.security.AccessController.doPrivileged(Native Method)
  at javax.security.auth.Subject.doAs(Subject.java:422)
  at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
  at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)
Caused by: java.util.concurrent.TimeoutException: Timeout waiting for task.
  at com.google.common.util.concurrent.AbstractFuture$Sync.get(AbstractFuture.java:276)
  at com.google.common.util.concurrent.AbstractFuture.get(AbstractFuture.java:96)
  at alluxio.client.netty.SingleResponseListener.get(SingleResponseListener.java:65)
  at alluxio.client.netty.NettyUnderFileSystemFileWriter.write(NettyUnderFileSystemFileWriter.java:81)
  ... 16 more
```
wwjiang007/alluxio,Alluxio/alluxio,Alluxio/alluxio,maboelhassan/alluxio,Reidddddd/alluxio,wwjiang007/alluxio,EvilMcJerkface/alluxio,WilliamZapata/alluxio,WilliamZapata/alluxio,wwjiang007/alluxio,PasaLab/tachyon,maobaolong/alluxio,wwjiang007/alluxio,ChangerYoung/alluxio,Reidddddd/mo-alluxio,yuluo-ding/alluxio,jsimsa/alluxio,ShailShah/alluxio,yuluo-ding/alluxio,PasaLab/tachyon,aaudiber/alluxio,ShailShah/alluxio,bf8086/alluxio,maboelhassan/alluxio,EvilMcJerkface/alluxio,maobaolong/alluxio,jswudi/alluxio,jswudi/alluxio,aaudiber/alluxio,Alluxio/alluxio,ShailShah/alluxio,Alluxio/alluxio,wwjiang007/alluxio,calvinjia/tachyon,yuluo-ding/alluxio,PasaLab/tachyon,calvinjia/tachyon,maobaolong/alluxio,Alluxio/alluxio,maobaolong/alluxio,bf8086/alluxio,Reidddddd/mo-alluxio,Alluxio/alluxio,maobaolong/alluxio,yuluo-ding/alluxio,bf8086/alluxio,uronce-cc/alluxio,calvinjia/tachyon,wwjiang007/alluxio,wwjiang007/alluxio,maboelhassan/alluxio,jsimsa/alluxio,EvilMcJerkface/alluxio,apc999/alluxio,Reidddddd/mo-alluxio,maobaolong/alluxio,calvinjia/tachyon,ShailShah/alluxio,Alluxio/alluxio,riversand963/alluxio,PasaLab/tachyon,Reidddddd/alluxio,yuluo-ding/alluxio,EvilMcJerkface/alluxio,aaudiber/alluxio,WilliamZapata/alluxio,Alluxio/alluxio,maboelhassan/alluxio,PasaLab/tachyon,jswudi/alluxio,riversand963/alluxio,uronce-cc/alluxio,bf8086/alluxio,wwjiang007/alluxio,EvilMcJerkface/alluxio,Reidddddd/alluxio,EvilMcJerkface/alluxio,apc999/alluxio,ChangerYoung/alluxio,yuluo-ding/alluxio,Reidddddd/alluxio,madanadit/alluxio,uronce-cc/alluxio,apc999/alluxio,madanadit/alluxio,riversand963/alluxio,WilliamZapata/alluxio,uronce-cc/alluxio,Reidddddd/mo-alluxio,Alluxio/alluxio,apc999/alluxio,madanadit/alluxio,ChangerYoung/alluxio,Reidddddd/mo-alluxio,Alluxio/alluxio,WilliamZapata/alluxio,EvilMcJerkface/alluxio,madanadit/alluxio,maboelhassan/alluxio,calvinjia/tachyon,ChangerYoung/alluxio,jsimsa/alluxio,maobaolong/alluxio,madanadit/alluxio,Reidddddd/alluxio,ChangerYoung/alluxio,uronce-cc/alluxio,madanadit/alluxio,wwjiang007/alluxio,riversand963/alluxio,uronce-cc/alluxio,ShailShah/alluxio,bf8086/alluxio,aaudiber/alluxio,Reidddddd/alluxio,madanadit/alluxio,calvinjia/tachyon,jsimsa/alluxio,aaudiber/alluxio,EvilMcJerkface/alluxio,WilliamZapata/alluxio,PasaLab/tachyon,jswudi/alluxio,maboelhassan/alluxio,apc999/alluxio,jswudi/alluxio,aaudiber/alluxio,aaudiber/alluxio,PasaLab/tachyon,Reidddddd/alluxio,jsimsa/alluxio,bf8086/alluxio,ChangerYoung/alluxio,jsimsa/alluxio,riversand963/alluxio,ShailShah/alluxio,Reidddddd/mo-alluxio,maobaolong/alluxio,apc999/alluxio,jswudi/alluxio,calvinjia/tachyon,wwjiang007/alluxio,apc999/alluxio,maobaolong/alluxio,madanadit/alluxio,maobaolong/alluxio,riversand963/alluxio,bf8086/alluxio,bf8086/alluxio,maboelhassan/alluxio,calvinjia/tachyon