As reported in bug 1154599, I'm seeing this on my desktop system:
$ python -c \
'from cloudinit import util; print util.is_resolvable("brickies.neiit")'
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "cloudinit/util.py", line 865, in is_resolvable
socket.SOCK_STREAM, socket.AI_CANONNAME)