Number of time steps in functional tests

[Ivar Stefansson]

Some of the functional tests use an extravagant number of time steps. To reduce run time, we will identify the tests and reduce number of time steps.

• Test test_benchmark_2d_case_3.py
• Test test_mandel.py
• Test test_manu_flow_incomp_frac.py
• Test test_terzaghi.py
• Test test_benchmark_3d_case_3.py
• Test test_manu_flow_comp_frac.py
• Test test_manu_poromech_nofrac.py
• Test test_manu_thermoporomech_nofrac.py