Port Ubuntu to support python 3.5

* parallel run dist ci

* test=develop

* update test=develop

 Fix warning of roi perspective transform op

test=develop

Avoid multiple definitions of lstm_compute_ctht when linking libpaddle_fluid.so

* "fix compile error"

* "fix ci"

* rerun ci
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* test=develop

rerun ci

test=develop

test=develop

This reverts commit 21bb9e91, reversing
changes made to 3fa68dc1.

test=develop

update libpaddle_fluid.a/so

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test=develop

test=develop

Merge branch 'add_python3_to_ubuntu_dockerfile' of https://github.com/velconia/Paddle into add_python3_to_ubuntu_dockerfile

test=develop

test=develop

hide all left over kwargs

test=develop

test=develop

reduce inference ci time

test=develop

Disable one test in test_quantize_transpiler.

clean up channel

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disable this two unittests to accelerate Mac unit test

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test=develop

Adding fused_embedding_fc_lstm op

fix random fail on test_api_impl

test=develop

* refine reduce by cub
* optimize KernelDepthwiseConvFilterGrad
* optimize depthwise conv and reduce mean and reduce sum
* fix bug: dilation
* cuda arch and cuda 8 compatible

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Add API.spec

test=develop