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add package requirement data in setup.py

trial_keeper use 50070 port to connect to webhdfs server, and PAI use a mapping method to map 50070 port to 5070 port to visit restful server, this method has some risk for PAI may not support this kind of mapping in later release.Now use Pylon path(/webhdfs/api/v1) instead of 50070 port in webhdfs client of trial_keeper, the path is transmitted in trainingService.
In this pr, we have these changes:

1. Change to use webhdfs path instead of 50070 port in hdfs client.
2. Change to use new hdfs package "PythonWebHDFS", which is build to support pylon by myself. You could test the new function from "sparksnail/nni:dev-pai" image to test pai trainingService.
3. Update some variables' name according to comments.

* add nni_gpu_tool in setup.py
* add exclude=['test'] in setup.py

* update pypi/makefile for multiple platform support

* update linux os spec

* udpate doc for installation & pypi

* update readme

* Change version number from v0.3.4 to v0.4, for NNI v0.4 release

* Fix pypi package missing python module

* Fix pypi package missing python module

* fix bug in smartparam example (#322)

* Fix nnictl update trialnum and document (#326)

1.Fix restful server of update
2.Update nnictl document of update
3.Add tensorboard in docement

* Update the version numbers from 0.3.2 to 0.3.3