#8729: pytest xdist multiprocess reset mechanism

- use custom pyhook from pytest-xdist to run cleanup after timeout
- add a new process based timeout method to pytest-timeout
- add reset after test fail, use '--metal-timeout' to enable reset mechanism
- use pytest-xdist fixture to determine # of workers through '-n auto'
- expose get_associated_mmio_device to python and only reset opened tt devices on fail