ML2 Cisco Nexus MD: Improve Unit Test Coverage

[Rich Curran]

Improve unit test coverage for:
neutron/plugins/ml2/drivers/cisco/
modules.
Current coverage info:
neutron/plugins/ml2/drivers/cisco/nexus_models_v2
13 1 4 0 94% 35
neutron/plugins/ml2/drivers/cisco/nexus_network_driver
111 20 20 4 82% 50, 74, 111-114, 159-162, 166-169, 206-209, 212-215
neutron/plugins/ml2/drivers/cisco/credentials_v2
27 6 4 0 81% 38-42, 47, 64-65, 71
neutron/plugins/ml2/drivers/cisco/mech_cisco_nexus
110 17 29 14 78% 76-83, 98, 119-122, 134-139, 151, 176
neutron/plugins/ml2/drivers/cisco/config
18 3 10 4 75% 58, 64-65

(Also see similar fixes made to plugin/cisco modules.
https://review.openstack.org/#/c/57100/
https://review.openstack.org/#/c/60370/
https://review.openstack.org/#/c/58882/)

[Openstack Gerrit (openstack-gerrit)]

Fix proposed to branch: master
Review: https://review.openstack.org/88695

[Openstack Gerrit (openstack-gerrit)]

Reviewed: https://review.openstack.org/88695
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=5ca43cd39431b49d347a6ff8637dd6388266e03a
Submitter: Jenkins
Branch: master

commit 5ca43cd39431b49d347a6ff8637dd6388266e03a
Author: Rich Curran <email address hidden>
Date: Fri Apr 18 17:09:08 2014 -0400

    ML2 Cisco Nexus MD: Improve Unit Test Coverage

    Improve unit test coverage for:
    neutron/plugins/ml2/drivers/cisco/ modules.

    Current coverage info:
    neutron/plugins/ml2/drivers/cisco/nexus/nexus_models_v2 65%
    neutron/plugins/ml2/drivers/cisco/nexus/nexus_network_driver 82%
    neutron/plugins/ml2/drivers/cisco/nexus/credentials_v2 81%
    neutron/plugins/ml2/drivers/cisco/nexus/mech_cisco_nexus 78%
    neutron/plugins/ml2/drivers/cisco/nexus/config 75%

    With these updates:
    neutron/plugins/ml2/drivers/cisco/nexus/mech_cisco_nexus 99%
    neutron/plugins/ml2/drivers/cisco/nexus/nexus_db_v2 99%
    neutron/plugins/ml2/drivers/cisco/nexus/nexus_models_v2 65%
    neutron/plugins/ml2/drivers/cisco/nexus/nexus_network_driver 98%
    neutron/plugins/ml2/drivers/cisco/nexus/config 100%

    NB: nexus_models_v2.py consists of database definitions and two
    customization methods, __repr__ and __eq__.

    Change-Id: I0de1cb9e71adffff698e37c8bec5497b88f0f0cd
    Closes-Bug: 1267481