cuda: New version 10.1.243 (#12777)
cuda: New version 10.1.243 (#12777)

* cuda: New version 10.1.243

Adds CUDA 10.1.243. The installer command-line arguments have slightly
changed, hence in the install method the version needs to be inspected
in order to give the correct arguments for the new installer.

* cuda: Combine common command-line arguments

The CUDA 10.1+ installer has slightly different command-line arguments
than previous versions.  Keep the common parts together and only split
where they are different.

* Make flake8 happy

LLNL/spack,iulian787/spack,LLNL/spack,LLNL/spack,iulian787/spack,LLNL/spack,iulian787/spack,LLNL/spack,iulian787/spack,iulian787/spack