Downgrades and pins pytest version

[mvilanova]

Tests are running and pytest exiting correctly.

tests/term/test_term_service.py::test_get PASSED                                                                                                       [ 95%]
tests/term/test_term_service.py::test_create PASSED                                                                                                    [ 95%]
tests/term/test_term_service.py::test_update PASSED                                                                                                    [ 96%]
tests/term/test_term_service.py::test_delete PASSED                                                                                                    [ 96%]
tests/ticket/test_ticket_service.py::test_get PASSED                                                                                                   [ 96%]
tests/ticket/test_ticket_service.py::test_get_by_resource_id PASSED                                                                                    [ 97%]
tests/ticket/test_ticket_service.py::test_get_all PASSED                                                                                               [ 97%]
tests/ticket/test_ticket_service.py::test_create PASSED                                                                                                [ 97%]
tests/workflow/test_workflow_service.py::test_get PASSED                                                                                               [ 98%]
tests/workflow/test_workflow_service.py::test_get_instance PASSED                                                                                      [ 98%]
tests/workflow/test_workflow_service.py::test_create PASSED                                                                                            [ 98%]
tests/workflow/test_workflow_service.py::test_create_instance PASSED                                                                                   [ 99%]
tests/workflow/test_workflow_service.py::test_update PASSED                                                                                            [ 99%]
tests/workflow/test_workflow_service.py::test_update_instance PASSED                                                                                   [ 99%]
tests/workflow/test_workflow_service.py::test_delete PASSED                                                                                            [100%]

============================================================== 303 passed, 3 skipped in 17.07s ===============================================================

[wssheldon]

Check