Remove use of spark.worker.instances

spark.worker.instances was added as part of this commit: https://github.com/apache/spark/commit/1617816090e7b20124a512a43860a21232ebf511

My understanding is that SPARK_WORKER_INSTANCES is supported for backwards compatibility,
but spark.worker.instances is never used (SparkSubmit.scala sets spark.executor.instances) so should
not have been added.

@sryza @pwendell @tgravescs LMK if I'm understanding this correctly

Author: Kay Ousterhout <kayousterhout@gmail.com>

Closes #1214 from kayousterhout/yarn_config and squashes the following commits:

3d7c491 [Kay Ousterhout] Remove use of spark.worker.instances

(cherry picked from commit 48a82a827c99526b165c78d7e88faec43568a37a)
Signed-off-by: Thomas Graves <tgraves@apache.org>
[SPARK-2251] fix concurrency issues in random sampler (branch-1.0)

The following code is very likely to throw an exception:

~~~
val rdd = sc.parallelize(0 until 111, 10).sample(false, 0.1)
rdd.zip(rdd).count()
~~~

because the same random number generator is used in compute partitions. This fix doesn't change the type signature.

@pwendell

Author: Xiangrui Meng <meng@databricks.com>

Closes #1234 from mengxr/fix-sample-1.0 and squashes the following commits:

88795e2 [Xiangrui Meng] fix concurrency issues in random sampler
[SPARK-2295] [SQL] Make JavaBeans nullability stricter.

Author: Takuya UESHIN <ueshin@happy-camper.st>

Closes #1235 from ueshin/issues/SPARK-2295 and squashes the following commits:

201c508 [Takuya UESHIN] Make JavaBeans nullability stricter.

(cherry picked from commit 32a1ad75313472b1b098f7ec99335686d3fe4fc3)
Signed-off-by: Michael Armbrust <michael@databricks.com>
[SPARK-2286][UI] Report exception/errors for failed tasks that are not ExceptionFailure

Also added inline doc for each TaskEndReason.

Author: Reynold Xin <rxin@apache.org>

Closes #1225 from rxin/SPARK-2286 and squashes the following commits:

6a7959d [Reynold Xin] Fix unit test failure.
cf9d5eb [Reynold Xin] Merge branch 'master' into SPARK-2286
a61fae1 [Reynold Xin] Move to line above ...
38c7391 [Reynold Xin] [SPARK-2286][UI] Report exception/errors for failed tasks that are not ExceptionFailure.
(cherry picked from commit 6587ef7c1783961e6ef250afa387271a1bd6e277)

Conflicts:

	core/src/main/scala/org/apache/spark/ui/jobs/StageTable.scala
Updating versions for 1.0.1 release
Small error in previous commit
Fixing AWS instance type information based upon current EC2 data

Fixed a problem in previous file in which some information regarding AWS instance types were wrong. Such information was updated base upon current AWS EC2 data.

Author: Zichuan Ye <jerry@tangentds.com>

Closes #1156 from jerry86/master and squashes the following commits:

ff36e95 [Zichuan Ye] Fixing AWS instance type information based upon current EC2 data
(cherry picked from commit 62d4a0fa9947e64c1533f66ae577557bcfb271c9)

Conflicts:

	ec2/spark_ec2.py
CHANGES.txt for release 1.0.1
[maven-release-plugin] prepare release v1.0.1-rc1
[maven-release-plugin] prepare for next development iteration
SPARK-2181:The keys for sorting the columns of Executor page in SparkUI are incorrect

Author: witgo <witgo@qq.com>

Closes #1135 from witgo/SPARK-2181 and squashes the following commits:

39dad90 [witgo] The keys for sorting the columns of Executor page in SparkUI are incorrect
(cherry picked from commit 18f29b96c7e0948f5f504e522e5aa8a8d1ab163e)

Signed-off-by: Patrick Wendell <pwendell@gmail.com>