Calling stop() on MDNSEngine causes AttributeError

[andrewbonney]

>>> from nmoscommon.mdns import MDNSEngine
>>> mdns = MDNSEngine()
>>> mdns.start()
>>> mdns.stop()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/dist-packages/nmoscommon/mdns/avahidbus.py", line 52, in stop
    self._mainloop.quit()
AttributeError: 'MDNSEngine' object has no attribute '_mainloop'

[jamesba]

try the following:

>>> from nmoscommon.mdns import MDNSEngine
>>> import gevent
>>> mdns = MDNSEngine()
>>> mdns.start()
>>> gevent.sleep(0)
>>> mdns.stop()
>>>

This is a gotcha with using gevent based libraries from the command prompt: you need to explicitly yield control to allow other greenlets (threads, essentially) an opportunity to run. gevent.sleep(0) does this by sleeping for 0 seconds.