SPARK-1937: fix issue with task locality

Don't check executor/host availability when creating a TaskSetManager. Because the executors may haven't been registered when the TaskSetManager is created, in which case all tasks will be considered "has no preferred locations", and thus losing data locality in later scheduling.

Author: Rui Li <rui.li@intel.com>
Author: lirui-intel <rui.li@intel.com>

Closes #892 from lirui-intel/delaySchedule and squashes the following commits:

8444d7c [Rui Li] fix code style
fafd57f [Rui Li] keep locality constraints within the valid levels
18f9e05 [Rui Li] restrict allowed locality
5b3fb2f [Rui Li] refine UT
99f843e [Rui Li] add unit test and fix bug
fff4123 [Rui Li] fix computing valid locality levels
685ed3d [Rui Li] remove delay shedule for pendingTasksWithNoPrefs
7b0177a [Rui Li] remove redundant code
c7b93b5 [Rui Li] revise patch
3d7da02 [lirui-intel] Update TaskSchedulerImpl.scala
cab4c71 [Rui Li] revised patch
539a578 [Rui Li] fix code style
cf0d6ac [Rui Li] fix code style
3dfae86 [Rui Li] re-compute pending tasks when new host is added
a225ac2 [Rui Li] SPARK-1937: fix issue with task locality
HOTFIX: Disabling tests per SPARK-2264
Fix broken Json tests.

The assertJsonStringEquals method was missing an "assert" so
did not actually check that the strings were equal. This commit
adds the missing assert and fixes subsequently revealed problems
with the JsonProtocolSuite.

@andrewor14 I changed some of the test functionality to match what it
looks like you intended based on the expected strings -- let me know if
anything here looks wrong.

Author: Kay Ousterhout <kayousterhout@gmail.com>

Closes #1198 from kayousterhout/json_test_fix and squashes the following commits:

77f858f [Kay Ousterhout] Fix broken Json tests.
[SPARK-2264][SQL] Fix failing CachedTableSuite

Author: Michael Armbrust <michael@databricks.com>

Closes #1201 from marmbrus/fixCacheTests and squashes the following commits:

9d87ed1 [Michael Armbrust] Use analyzer (which runs to fixed point) instead of manually removing analysis operators.
[SPARK-1112, 2156] Bootstrap to fetch the driver's Spark properties.

This is an alternative solution to #1124 . Before launching the executor backend, we first fetch driver's spark properties and use it to overwrite executor's spark properties. This should be better than #1124.

@pwendell Are there spark properties that might be different on the driver and on the executors?

Author: Xiangrui Meng <meng@databricks.com>

Closes #1132 from mengxr/akka-bootstrap and squashes the following commits:

77ff32d [Xiangrui Meng] organize imports
68e1dfb [Xiangrui Meng] use timeout from AkkaUtils; remove props from RegisteredExecutor
46d332d [Xiangrui Meng] fix a test
7947c18 [Xiangrui Meng] increase slack size for akka
4ab696a [Xiangrui Meng] bootstrap to retrieve driver spark conf
[SQL]Add base row updating methods for JoinedRow

This will be helpful in join operators.

Author: Cheng Hao <hao.cheng@intel.com>

Closes #1187 from chenghao-intel/joinedRow and squashes the following commits:

87c19e3 [Cheng Hao] Add base row set methods for JoinedRow
Autodetect JAVA_HOME on RPM-based systems

Author: Matthew Farrellee <matt@redhat.com>

Closes #1185 from mattf/master-1 and squashes the following commits:

42150fc [Matthew Farrellee] Autodetect JAVA_HOME on RPM-based systems
Fix possible null pointer in acumulator toString

Author: Michael Armbrust <michael@databricks.com>

Closes #1204 from marmbrus/nullPointerToString and squashes the following commits:

35b5fce [Michael Armbrust] Fix possible null pointer in acumulator toString
SPARK-2248: spark.default.parallelism does not apply in local mode

Author: witgo <witgo@qq.com>

Closes #1194 from witgo/SPARK-2248 and squashes the following commits:

6ac950b [witgo] spark.default.parallelism does not apply in local mode
[SPARK-2263][SQL] Support inserting MAP<K, V> to Hive tables

JIRA issue: [SPARK-2263](https://issues.apache.org/jira/browse/SPARK-2263)

Map objects were not converted to Hive types before inserting into Hive tables.

Author: Cheng Lian <lian.cs.zju@gmail.com>

Closes #1205 from liancheng/spark-2263 and squashes the following commits:

c7a4373 [Cheng Lian] Addressed @concretevitamin's comment
784940b [Cheng Lian] SARPK-2263: support inserting MAP<K, V> to Hive tables
[BUGFIX][SQL] Should match java.math.BigDecimal when wnrapping Hive output

The `BigDecimal` branch in `unwrap` matches to `scala.math.BigDecimal` rather than `java.math.BigDecimal`.

Author: Cheng Lian <lian.cs.zju@gmail.com>

Closes #1199 from liancheng/javaBigDecimal and squashes the following commits:

e9bb481 [Cheng Lian] Should match java.math.BigDecimal when wnrapping Hive output
SPARK-2038: rename "conf" parameters in the saveAsHadoop functions with source-compatibility

https://issues.apache.org/jira/browse/SPARK-2038

to differentiate with SparkConf object and at the same time keep the source level compatibility

Author: CodingCat <zhunansjtu@gmail.com>

Closes #1137 from CodingCat/SPARK-2038 and squashes the following commits:

11abeba [CodingCat] revise the comments
7ee5712 [CodingCat] to keep the source-compatibility
763975f [CodingCat] style fix
d91288d [CodingCat] rename "conf" parameters in the saveAsHadoop functions
Move sort into shuffle implementations
Minor changes about naming and order
Fix issues related to unit test
Change sort flag into Option