[SPARK-4124] [MLlib] [PySpark] simplify serialization in MLlib Python API

Create several helper functions to call MLlib Java API, convert the arguments to Java type and convert return value to Python object automatically, this simplify serialization in MLlib Python API very much.

After this, the MLlib Python API does not need to deal with serialization details anymore, it's easier to add new API.

cc mengxr

Author: Davies Liu <davies@databricks.com>

Closes #2995 from davies/cleanup and squashes the following commits:

8fa6ec6 [Davies Liu] address comments
16b85a0 [Davies Liu] Merge branch 'master' of github.com:apache/spark into cleanup
43743e5 [Davies Liu] bugfix
731331f [Davies Liu] simplify serialization in MLlib Python API
[SPARK-3250] Implement Gap Sampling optimization for random sampling

More efficient sampling, based on Gap Sampling optimization:
http://erikerlandson.github.io/blog/2014/09/11/faster-random-samples-with-gap-sampling/

Author: Erik Erlandson <eerlands@redhat.com>

Closes #2455 from erikerlandson/spark-3250-pr and squashes the following commits:

72496bc [Erik Erlandson] [SPARK-3250] Implement Gap Sampling optimization for random sampling
[SPARK-4108][SQL] Fixed usage of deprecated in sql/catalyst/types/datatypes

Fixed usage of deprecated in sql/catalyst/types/datatypes to have versio...n parameter

Author: Anant <anant.asty@gmail.com>

Closes #2970 from anantasty/SPARK-4108 and squashes the following commits:

e92cb01 [Anant] Fixed usage of deprecated in sql/catalyst/types/datatypes to have version parameter
[SPARK-4143] [SQL] Move inner class DeferredObjectAdapter to top level

The class DeferredObjectAdapter is the inner class of HiveGenericUdf, which may cause some overhead in closure ser/de-ser. Move it to top level.

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

Closes #3007 from chenghao-intel/move_deferred and squashes the following commits:

3a139b1 [Cheng Hao] Move inner class DeferredObjectAdapter to top level