PR #240 from @heasterday: test/Dockerfile.openmpi: fix PSM2 version (closes #239)
PR #240 from @heasterday: test/Dockerfile.openmpi: fix PSM2 version (closes #239)

Increment version of PSM2 to resolve OpenMPI image build failures.
hpc/charliecloud,hpc/charliecloud,hpc/charliecloud