Comment 1 for bug 1549980

This is was later found to be reproducible by a simple curl request against the mdns port.

 Traceback (most recent call last):
   File "/opt/designate/designate/local/lib/python2.7/site-packages/eventlet/hubs/hub.py", line 457, in fire_timers
     timer()
   File "/opt/designate/designate/local/lib/python2.7/site-packages/eventlet/hubs/timer.py", line 58, in __call__
     cb(*args, **kw)
   File "/opt/designate/designate/local/lib/python2.7/site-packages/eventlet/hubs/__init__.py", line 154, in _timeout
     current.throw(exc)
   File "/opt/designate/designate/local/lib/python2.7/site-packages/eventlet/greenthread.py", line 214, in main
     result = function(*args, **kwargs)
   File "/opt/designate/designate/local/lib/python2.7/site-packages/designate/service.py", line 269, in _dns_handle_tcp
     errname = errno.errorcode[e.args[0]]
 KeyError: 'timed out'

A resolution for the root cause can be found in the commit message for the fix.