python/ovs: socket_util uses select.poll

The changeset of ed815d9bd2 eliminated
the use of select.poll for eventlet/gevent.
It forgot to select.poll in socket_util.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Ben Pfaff <blp@nicira.com>

python/ovs/poller.py

@@ -73,7 +73,7 @@ class _SelectSelect(object):
         return events_dict.items()
 
 
-_SelectPoll = _SelectSelect
+SelectPoll = _SelectSelect
 # If eventlet/gevent isn't used, we can use select.poll by replacing
 # _SelectPoll with select.poll class
 # _SelectPoll = select.poll
@@ -181,5 +181,5 @@ class Poller(object):
                     vlog.dbg("%s on fd %d" % (s, fd))
 
     def __reset(self):
-        self.poll = _SelectPoll()
+        self.poll = SelectPoll()
         self.timeout = -1