case.setup failure on compy with --mpilib=mvapich2

Steps to reproduce on compy:
```
ssh compy.pnl.gov

git clone https://github.com/E3SM-Project/E3SM.git
cd E3SM
git submodule update --init

cd cime/scripts
./create_newcase --compiler=intel --mpilib=mvapich2 --case X_f19_g16_intel_mvapich2 --compset X --res f19_g16 --project e3sm
cd X_f19_g16_intel_mvapich2
./case.setup

cd ..
./create_newcase --compiler=pgi --mpilib=mvapich2 --case X_f19_g16_pgi_mvapich2 --compset X --res f19_g16 --project e3sm
cd X_f19_g16_pgi_mvapich2
./case.setup
```
Error output:
```
ERROR: module command /share/apps/modules/bin/modulecmd python load cmake/3.19.6 gcc/8.1.0 intel/19.0.5 mvapich2/2.3.1 netcdf/4.6.3 pnetcdf/1.9.0 mkl/2019u5 failed with message:
The combination of compiler and MPI does not appear to be built yet

ERROR: module command /share/apps/modules/bin/modulecmd python load cmake/3.19.6 pgi/19.10 mvapich2/2.3.1 netcdf/4.6.3 pnetcdf/1.9.0 mkl/2019u5 failed with message:
The combination of compiler and MPI does not appear to be built yet
```
Possible workaround:
* Use intel/19.0.4 instead of intel/19.0.5 for "--compiler=intel --mpilib=mvapich2"
* Use pgi/19.7 instead of pgi/19.10 for "--compiler=pgi --mpilib=mvapich2"