Update Dockerfile, fix gpg key error

This makes the gpg key work, I don't know why. See here: https://github.com/NVIDIA/nvidia-docker/issues/1632#issuecomment-1112667716

Dockerfile

@@ -1,5 +1,7 @@
 FROM tensorflow/tensorflow:1.15.2-gpu-py3-jupyter
 
+RUN rm /etc/apt/sources.list.d/cuda.list
+RUN rm /etc/apt/sources.list.d/nvidia-ml.list
 LABEL maintainer="Luke Berndt <lberndt@iqt.org>"
 
 RUN apt-get update && apt-get install -y \
@@ -10,4 +12,4 @@ RUN git clone https://github.com/tensorflow/models.git
 
 RUN pip install contextlib2 Pillow tf_slim tensorflowjs
 
-ENV PYTHONPATH "${PYTHONPATH}:/tf/models/research/slim"
+ENV PYTHONPATH "${PYTHONPATH}:/tf/models/research/slim"