WIP GROMACS reframe tests

[kanduri]

Build and download test in progress for the develop view

More tests for the gromacs( and later plumed) view also underway which are independent of the develop tests.

The reframe.yaml file being used here looks like the following:

run:
  features:
    - gromacs 
    - cuda
    - mpi
  cc: gcc
  cxx: g++
  views:
    - gromacs

build:
  features:
    - gromacs 
    - cuda
    - mpi
  cc: gcc
  cxx: g++
  views:
    - develop

[jgphpc]

dev will be back in Jan/25