Fix wrong example in HACKING.rst

Example of Human Alphabetical Order Examples section in HACKING.rst
is wrong, this patch fixes it to the right order.

Closes-Bug: #1213568

Change-Id: Ib7f8baf20c437c3fa776201998c36f33bdde2f78

HACKING.rst

@@ -75,8 +75,8 @@ Example::
   from neutron.api import ports
   from neutron.db import models
   from neutron.extensions import multiport
-  from neutron.openstack.common import log as logging
   import neutron.manager
+  from neutron.openstack.common import log as logging
   from neutron import service