tsuite: add MPI version setting to runtests.
To specify the MPI version to use in runtests, -mpiversion option and the environment variable MPITEST_MPIVERSION were added to runtests. If neither -mpiversion nor MPITEST_MPIVERSION is set, the default MPI version, which has been detected by configure, is used for testing. Signed-off-by: Pavan Balaji <firstname.lastname@example.org>
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