cdms2.open() hitting segfault 11 with mpich libnetcdf

[Lina Muryanto]

cdms2.open() hitting segfault 11 with mpich libnetcdf, Only hit this segfault if we do import cdat_info or testsrunner into the env. Jason is looking into this. (have vtk-cdat in the test env) -- this may push us to use vtk instead of vtk-cdat