Error in creating dome simulator within huntsman-pocs.

[bazkiaei]

This issue was found in the following PR from huntsman-pocs:
https://github.com/AstroHuntsman/huntsman-pocs/pull/245

Description:

To test the dome states, the simulated dome is created as follow:

@pytest.fixture(scope='function')
def dome():
    set_config('dome', {
        'brand': 'Simulacrum',
        'driver': 'simulator',
    })
    return create_dome_simulator()

The simulated dome needs to be added to the observatory class. We expect pocs = POCS(observatory, run_once=True, dome=dome) works but it does not create the dome object. An attribute error raises as follow when trying to command the dome:

pocs.observatory.dome.close()
E       AttributeError: 'NoneType' object has no attribute 'close'

[lspitler]

Might need to modify code related to dome/shutter code to be more python-y here: AstroHuntsman/huntsman-pocs#245