[Test] Add unittest against TFX (#2346)
[Test] Add unittest against TFX (#2346)

* Add unittest against TFX in travis.

* Add protoc package.

* Fix protoc install

* fix extension

* fix

* fix

* fix

* fix

* fix env

* fix permission

* make executable

* fix protoc

* fix os version

* Add pythonpath

* Fix behavior of pip3 install

* Update pip3

* fix pip

* fix pip

* fix pip

* fix

* fix pip

* add debug info

* add setuptools

* add back pip3

* fix

* Fix tfx

* Fix pip3

* adjust order

* adjust order

* Fix

* Fix tensorflow version

* Clean up

* Clean up

* Exclude py37 from test

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