Delete linux-py2.txt (#830)

requirements/linux-py2.txt

@@ -1,16 +0,0 @@
-paddlepaddle==0.11.0
-six==1.10.0
-numpy==1.15.4
-protobuf==3.6.1
-pillow ==6.2.1
-setuptools==39.1.0
-tensorflow==1.13.1
-keras==2.2.4
-coremltools==2.1.0
-mxnet==1.2.0
-cntk==2.6
-http://download.pytorch.org/whl/cpu/torch-0.4.0-cp27-cp27mu-linux_x86_64.whl
-https://raw.githubusercontent.com/PaulaQin/pycaffe_packages/master/caffe-1.0-py2-none-any.whl
-torchvision==0.2.1
-onnx==1.4.1
-onnx-tf==1.1.2