[SPARK-2322] Exception in resultHandler should NOT crash DAGScheduler and shutdown SparkContext.

This should go into 1.0.1.

Author: Reynold Xin <rxin@apache.org>

Closes #1264 from rxin/SPARK-2322 and squashes the following commits:

c77c07f [Reynold Xin] Added comment to SparkDriverExecutionException and a test case for accumulator.
5d8d920 [Reynold Xin] [SPARK-2322] Exception in resultHandler could crash DAGScheduler and shutdown SparkContext.
[SPARK-2318] When exiting on a signal, print the signal name first.

Author: Reynold Xin <rxin@apache.org>

Closes #1260 from rxin/signalhandler1 and squashes the following commits:

8e73552 [Reynold Xin] Uh add Logging back in ApplicationMaster.
0402ba8 [Reynold Xin] Synchronize SignalLogger.register.
dc70705 [Reynold Xin] Added SignalLogger to YARN ApplicationMaster.
79a21b4 [Reynold Xin] Added license header.
0da052c [Reynold Xin] Added the SignalLogger itself.
e587d2e [Reynold Xin] [SPARK-2318] When exiting on a signal, print the signal name first.
SPARK-2293. Replace RDD.zip usage by map with predict inside.

This is the only occurrence of this pattern in the examples that needs to be replaced. It only addresses the example change.

Author: Sean Owen <sowen@cloudera.com>

Closes #1250 from srowen/SPARK-2293 and squashes the following commits:

6b1b28c [Sean Owen] Compute prediction-and-label RDD directly rather than by zipping, for efficiency
SPARK-2332 [build] add exclusion for old servlet-api on hadoop-client in core

Fix for class of test suite failures in jenkins

Author: Peter MacKinnon <pmackinn@redhat.com>

Closes #1271 from pdmack/master and squashes the following commits:

cfe59fd [Peter MacKinnon] exclude servlet-api in hadoop-client for sbt
6f39fec [Peter MacKinnon] add exclusion for old servlet-api on hadoop-client in core
[SPARK-2185] Emit warning when task size exceeds a threshold.

This functionality was added in an earlier commit but shortly
after was removed due to a bad git merge (totally my fault).

Author: Kay Ousterhout <kayousterhout@gmail.com>

Closes #1149 from kayousterhout/warning_bug and squashes the following commits:

3f1bb00 [Kay Ousterhout] Fixed Json tests
462a664 [Kay Ousterhout] Removed task set name from warning message
e89b2f6 [Kay Ousterhout] Fixed Json tests.
7af424c [Kay Ousterhout] Emit warning when task size exceeds a threshold.
Merge pull request #2 from apache/master

merge from spark master