Test adolc/helper_scalar_coupled_3_components_01* - fix race condition

All tests of a test variant have to be annotated by
"with_mpi=true.mpirun=" otherwise we risk the chance of the executable
being temporarily deleted and recompiled.

See also: https://cdash.43-1.org/testDetails.php?test=43888682&build=6235

diff --git a/tests/adolc/helper_scalar_coupled_3_components_01_1.output b/tests/adolc/helper_scalar_coupled_3_components_01_1.with_mpi=true.mpirun=1.output
similarity index 100%
rename from tests/adolc/helper_scalar_coupled_3_components_01_1.output
rename to tests/adolc/helper_scalar_coupled_3_components_01_1.with_mpi=true.mpirun=1.output

diff --git a/tests/adolc/helper_scalar_coupled_3_components_01_2.output b/tests/adolc/helper_scalar_coupled_3_components_01_2.with_mpi=true.mpirun=1.output
similarity index 100%
rename from tests/adolc/helper_scalar_coupled_3_components_01_2.output
rename to tests/adolc/helper_scalar_coupled_3_components_01_2.with_mpi=true.mpirun=1.output