Spark 1489 Fix the HistoryServer view acls

This allows the view acls set by the user to be enforced by the history server.  It also fixes filters being applied properly.

Author: Thomas Graves <tgraves@apache.org>

Closes #509 from tgravescs/SPARK-1489 and squashes the following commits:

869c186 [Thomas Graves] change to either acls enabled or disabled
0d8333c [Thomas Graves] Add history ui policy to allow acls to either use application set, history server force acls on, or off
65148b5 [Thomas Graves] SPARK-1489 Fix the HistoryServer view acls
(cherry picked from commit 44da5ab2dea6dcf1e13d624784741141883870bb)

Signed-off-by: Patrick Wendell <pwendell@gmail.com>
[SPARK-1510] Spark Streaming metrics source for metrics system

This pulls in changes made by @jerryshao in https://github.com/apache/spark/pull/424 and merges with the master.

Author: jerryshao <saisai.shao@intel.com>
Author: Tathagata Das <tathagata.das1565@gmail.com>

Closes #545 from tdas/streaming-metrics and squashes the following commits:

034b443 [Tathagata Das] Merge remote-tracking branch 'apache-github/master' into streaming-metrics
fb3b0a5 [jerryshao] Modify according master update
21939f5 [jerryshao] Style changes according to style check error
976116b [jerryshao] Add StreamSource in StreamingContext for better monitoring through metrics system

(cherry picked from commit 80429f3e2ab786d103297652922c3d8da3cf5a01)
Signed-off-by: Tathagata Das <tathagata.das1565@gmail.com>