Tests: rename output variant

All of these output variants are for complex number, thus call the file
"output.complex-output" instead of "output.2".

diff --git a/tests/gla/block_mat_02.mpirun=1.output.2 b/tests/gla/block_mat_02.mpirun=1.output.complex-output
similarity index 100%
rename from tests/gla/block_mat_02.mpirun=1.output.2
rename to tests/gla/block_mat_02.mpirun=1.output.complex-output

diff --git a/tests/gla/block_mat_02.mpirun=2.output.2 b/tests/gla/block_mat_02.mpirun=2.output.complex-output
similarity index 100%
rename from tests/gla/block_mat_02.mpirun=2.output.2
rename to tests/gla/block_mat_02.mpirun=2.output.complex-output

diff --git a/tests/gla/block_mat_02.mpirun=4.output.2 b/tests/gla/block_mat_02.mpirun=4.output.complex-output
similarity index 100%
rename from tests/gla/block_mat_02.mpirun=4.output.2
rename to tests/gla/block_mat_02.mpirun=4.output.complex-output

diff --git a/tests/gla/mat_03.mpirun=2.output.2 b/tests/gla/mat_03.mpirun=2.output.complex-output
similarity index 100%
rename from tests/gla/mat_03.mpirun=2.output.2
rename to tests/gla/mat_03.mpirun=2.output.complex-output

diff --git a/tests/gla/mat_04.mpirun=2.output.2 b/tests/gla/mat_04.mpirun=2.output.complex-output
similarity index 100%
rename from tests/gla/mat_04.mpirun=2.output.2
rename to tests/gla/mat_04.mpirun=2.output.complex-output