LBaaS Message of DeviceNotFoundOnAgent is still the default one

[Jian Wen]

The default message of an exception is "An unknown exception occurred.".
Need to use 'message' instead of 'msg' for the following exception, otherwise
the default message is logged.

class DeviceNotFoundOnAgent(n_exc.NotFound):
    msg = _('Unknown device with loadbalancer_id %(loadbalancer_id)s')

[Al Miller (al-miller)]

It also apears that the same issue exists with the message related to pool_id in neutron_lbaas/services/loadbalancer/agent/agent_manager.py

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/195960
Committed: https://git.openstack.org/cgit/openstack/neutron-lbaas/commit/?id=ac2dc4b71346c06a05ea99dd2f793d385fee79fa
Submitter: Jenkins
Branch: master

commit ac2dc4b71346c06a05ea99dd2f793d385fee79fa
Author: Jian Wen <email address hidden>
Date: Fri Jun 26 17:48:26 2015 +0800

    Use message for DeviceNotFoundOnAgent

    Need to use 'message' instead of 'msg' for every exception of neutron.

    Change-Id: Ifd989703f2b13b64d07b83051222c7d1aca5dfbc
    Closes-bug: 1469080