Port MCH tests to the C2SM environments

[vkarak]

Tests to be ported:

• cscs-checks/mch/automatic_arrays.py
• cscs-checks/mch/g2g_meteoswiss_check.py
• cscs-checks/mch/gpu_direct_acc.py
• cscs-checks/mch/gpu_direct_cuda.py
• cscs-checks/mch/openacc_cuda_mpi_cppstd.py
• cscs-checks/mch/collectives_halo.py
• cscs-checks/mch/cuda_stress_test.py
• cscs-checks/tools/io/cdo.py
• cscs-checks/tools/io/nco.py