[SPARK-21070][PYSPARK] Upgrade cloudpickle

This brings in fixes and upgrades from the [cloudpickle](https://github.com/cloudpipe/cloudpickle) module, notably:

* Import submodules accessed by pickled functions (cloudpipe/cloudpickle#80)
* Support recursive functions inside closures (cloudpipe/cloudpickle#89, cloudpipe/cloudpickle#90)
* Fix ResourceWarnings and DeprecationWarnings (cloudpipe/cloudpickle#88)
* Assume modules with __file__ attribute are not dynamic (cloudpipe/cloudpickle#85)
* Make cloudpickle Python 3.6 compatible (cloudpipe/cloudpickle#72)
* Allow pickling of builtin methods (cloudpipe/cloudpickle#57)
* Add ability to pickle dynamically created modules (cloudpipe/cloudpickle#52)
* Support method descriptor (cloudpipe/cloudpickle#46)
* No more pickling of closed files, was broken on Python 3 (cloudpipe/cloudpickle#32)