human
Complete the below
def disable_event_thread(self):

    ''''Disable nova libvirt driver event thread.
    The Nova libvirt driver includes a native thread which monitors
    the libvirt event channel. In a testing environment this becomes
    problematic because it means we\'ve got a floating thread calling
    sleep(1) over the life of the unit test. Seems harmless? It\'s not,
    because we sometimes want to test things like retry loops that
    should have specific sleep paterns. An unlucky firing of the
    libvirt thread will cause a test failure.'
    '''
assistant
#Here is the Python code you requested.
    import nova.virt.libvirt.host
    def evloop(*args, **kwargs):
        pass
    self.useFixture(fixtures.MonkeyPatch('nova.virt.libvirt.host.Host._init_events', evloop))