Remove python setup from artifact linux Dockerfiles

tools/dockerfile/grpc_artifact_linux_x64/Dockerfile

@@ -51,18 +51,6 @@ RUN touch .profile
 RUN curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.25.4/install.sh | bash
 RUN /bin/bash -l -c "nvm install 8 && npm install -g node-pre-gyp"
 
-##################
-# Python dependencies
-
-RUN apt-get update && apt-get install -y \
-    python-all-dev \
-    python3-all-dev \
-    python-pip
-
-RUN pip install pip --upgrade
-RUN pip install virtualenv
-RUN pip install futures==2.2.0 enum34==1.0.4 protobuf==3.2.0
-
 
 ##################
 # Ruby dependencies

tools/dockerfile/grpc_artifact_linux_x86/Dockerfile

@@ -51,18 +51,6 @@ RUN touch .profile
 RUN curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.25.4/install.sh | bash
 RUN /bin/bash -l -c "nvm install 8 && npm install -g node-pre-gyp"
 
-##################
-# Python dependencies
-
-RUN apt-get update && apt-get install -y \
-    python-all-dev \
-    python3-all-dev \
-    python-pip
-
-RUN pip install pip --upgrade
-RUN pip install virtualenv
-RUN pip install futures==2.2.0 enum34==1.0.4 protobuf==3.2.0
-
 
 ##################
 # Ruby dependencies