'Get all the hardware instances'

def get_physical_servers(self):

    hw = SoftLayer.HardwareManager(self.client)
    mask = ('mask[%s]' % ','.join(itertools.chain(self.common_items, self.hw_items)))
    instances = hw.list_hardware(mask=mask)
    for instance in instances:
        self.process_instance(instance, 'hardware')
