removed cuda experimental support in docker files

ci/docker_images/ubuntu/bionic/Dockerfile

@@ -206,17 +206,6 @@ RUN cd /tmp                                      \
  && cd -                                         \
  && rm -Rf /tmp/pyFFTW
 
-# CUDA 9.2 for ubuntu 17.10 (if nvidia gpu is present)
-# This assumes an up to date driver is present on host 
-# while building docker file.
-RUN (lspci | grep -i vga | grep -i nvidia)
- && apt-get update \
- && apt install gnupg-curl
- && dpkg --install https://developer.download.nvidia.com/compute/cuda/repos/ubuntu1710/x86_64/cuda-repo-ubuntu1710_9.2.148-1_amd64.deb
- && apt-key adv --fetch-key https://developer.download.nvidia.com/compute/cuda/repos/ubuntu1710/x86_64/7fa2af80.pub
- && apt-get update
- && apt-get install cuda
-
 # ensure all libraries are known by the runtime linker
 RUN ldconfig