test: refactor tests for docker

.gitlab-ci.yml

test/access_node/arbor/test_arbor_get_cell_infos.py

test/access_node/arbor/test_arbor_get_probe_data.py

test/access_node/nest/access_node.log

test/access_node/nest/config.py

test/access_node/nest/insite.log

test/access_node/tvb/test_data.py

test/access_node/tvb/test_monitors.py

test/access_node/tvb/test_simulation_info.py

test/access_node/tvb/tvb_general_test_functions.py

test/conftest.py

test/insite.yml

test/nest_module/test_get_gids.py

test/nest_module/test_get_multimeters.py

test/nest_module/test_get_neuron_properties.py

test/nest_module/test_get_populations.py

test/nest_module/test_get_simulation_time_info.py

test/nest_module/test_get_spikedetectors.py

test/nest_module/test_kernel_status.py

test/nest_test_network/NESTServerClient/NESTServerClient.py