Port Cisco nexus and network db UT to ML2 mech driver UT

[Dane LeBlanc]

Port the Cisco Nexus database and network database
unit tests to the Cisco ML2 mechanism driver UT.
The existing test scripts which will be ported are:
    neutron/tests/unit/cisco/test_nexus_db.py
    neutron/tests/unit/cisco/test_network_db.py
The new test scripts will be:
    neutron/tests/unit/ml2/drivers/test_cisco_nexus_db.py
    neutron/tests/unit/ml2/drivers/test_cisco_network_db.py

Note that the QoS database related tests in
test_network_db.py will not be ported because QoS is
not currently supported in the Cisco ML2
mechanism driver.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/47517

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/47517
Committed: http://github.com/openstack/neutron/commit/512055ec63fcb081cda01b9ef40c15a91f78d7ac
Submitter: Jenkins
Branch: master

commit 512055ec63fcb081cda01b9ef40c15a91f78d7ac
Author: Dane LeBlanc <email address hidden>
Date: Thu Sep 19 23:30:56 2013 -0400

    Port Cisco nexus and network db UT to ML2 mech driver UT

    Fixes bug 1227964

    This fix ports the Cisco Nexus database and network database
    unit tests to the Cisco ML2 mechanism driver UT.
    The existing test scripts which are ported:
        neutron/tests/unit/cisco/test_nexus_db.py
        neutron/tests/unit/cisco/test_network_db.py
    The new test scripts are:
        neutron/tests/unit/ml2/drivers/test_cisco_nexus_db.py
        neutron/tests/unit/ml2/drivers/test_cisco_network_db.py

    Note that the QoS database related tests in
    test_network_db.py are not ported because QoS is
    not currently supported in the Cisco ML2
    mechanism driver.

    Change-Id: Ib47dab9dafde7c4b8cf0a4930379750f00b9455c