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We had some issues yesterday on our Liberty cloud that smelled networky, 
so I went to check the neutron logfiles on cloud-controller... and there 
were a bunch of issues.
1) neutron-server hadn't been *running* since February.
2) It doesn't start on reboot.
3) When I try to start it manually, I get all sorts of errors in 
neutron-server.log; all of them seem to boil down to this:

2016-06-07 10:12:29.364 3824 ERROR neutron.services.service_base 
ImportError: No module named drivers.haproxy.plugin_driver
2016-06-07 10:12:29.366 3824 ERROR neutron.common.config ImportError: No 
module named drivers.haproxy.plugin_driver


 From poking around, it certainly *looks* as if the right files exist:

root at juju-machine-1-lxc-1:/var/log/neutron# locate haproxy | grep plugin
/usr/lib/python2.7/dist-packages/neutron_lbaas/drivers/haproxy/plugin_driver.py
/usr/lib/python2.7/dist-packages/neutron_lbaas/drivers/haproxy/plugin_driver.pyc
/usr/lib/python2.7/dist-packages/neutron_lbaas/services/loadbalancer/drivers/haproxy/plugin_driver.py
/usr/lib/python2.7/dist-packages/neutron_lbaas/services/loadbalancer/drivers/haproxy/plugin_driver.pyc
/usr/local/lib/nagios/plugins/check_haproxy.sh
/usr/local/lib/nagios/plugins/check_haproxy_queue_depth.sh

But I'm unsure how to verify that those are, indeed, the correct files, 
as the error message seems to be using a namespace unrelated to 
filenames.

If anyone has any insights, advice, etc., it would be much appreciated.

Thanks!

-Ken