CIsco CSR VPNaaS service & device driver cleanup

[Paul Michali]

Post blueprint vpnaas-cisco, there were minor review comments that this bug will address.

- LOG.error -> LOG.exception in _request() of device driver
- assertEqual(0, ...call_count) -> AssertFalse(...called) for two UTs in device driver

[Paul Michali (pcm)]

If httmock package is added to test-requirements as part of 75296 review, we can enable REST API unit tests for device driver.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/80062

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/80062
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=7f096512bbccee92da24e8f408f1d7f4f100cc95
Submitter: Jenkins
Branch: master

commit 7f096512bbccee92da24e8f408f1d7f4f100cc95
Author: Paul Michali <email address hidden>
Date: Wed Mar 12 14:04:30 2014 +0000

    Cisco VPN device driver post-merge cleanup

    During review for I-3 there were some minor comments regarding log
    level on message and asserts for mock calls.

    In addition, some debug logging enhancements were made between the
    service and device driver to better indicate the source of the
    shared "vpnservice_updated" RPC.

    Lastly, unit tests were updated, based on a newer Cisco CSR image,
    which had REST API fixes and behavior changes.

    Change-Id: I22277462270df0b2cd642ec576e8652c9df146b5
    Closes-bug: 1288387