[kubernetes-worker] Charm always installs the latest cuda package

[Takahisa Tanaka]

I'm using kubernetes-worker#81 charm. Although I specify cuda version (ex. 8.0.61-1) which is not latest in cuda-version optinon, the latest cuda packages will be installed.

First, install_cuda() in reactive/cuda.sh installs the cure-repo-<cuda-version> package and registers cuda's repository. However, the content of cuda-repo-<cuda-version> has all the same URL as below, and this repository contains all versions of cuda packages.

$ cat /etc/apt/sources.list.d/cuda.list
deb http://developer.download.nvidia.com/compute/cuda/repos/ubuntu1604/x86_64 /
$

When cuda packages are installed, the latest cuda packages will be installed because only a package name is specified for apt-get install.
Please fix so that the version of cuda package specified by cuda-version option is installed.

function all::all::install_cuda() {
    cd /tmp
    [ -f ${REPO_PKG} ] && rm -f ${REPO_PKG}
    wget ${REPO_URL}
    dpkg -i /tmp/${REPO_PKG}
    apt-get update -qq && \
    apt-get install -yqq --allow-downgrades --allow-remove-essential --allow-change-held-packages --no-install-recommends \
        cuda
    rm -f ${REPO_PKG}
}