quark UT warnings part 2

[alexander medvedev]

The following type of Warnings have been addressed:

quark/.tox/py27/local/lib/python2.7/site-packages/sqlalchemy/sql/default_comparator.py:153:
SAWarning: The IN-predicate on "quark_routes.subnet_id" was invoked with an empty sequence. This results in a contradiction, which nonetheless can be expensive to evaluate. Consider alternative strategies for improved performance.

and

quark/.tox/py27/local/lib/python2.7/site-packages/sqlalchemy/orm/unitofwork.py:235: SAWarning: Object of type <DNSNameserver> not in session, add operation along 'Subnet.dns_nameservers' will not proceed

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/345056

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/345056
Committed: https://git.openstack.org/cgit/openstack/quark/commit/?id=be9f815458fe3af4701b00dcce66a87fe7b97a6b
Submitter: Jenkins
Branch: master

commit be9f815458fe3af4701b00dcce66a87fe7b97a6b
Author: Alexander Medvedev <email address hidden>
Date: Wed Jul 20 16:19:28 2016 -0500

    Fixes for quark UT warnings

    Silenced a few more warnings from UTs.
    Many subnet create_ and update_ methods add new objects to the session.
    Unit tests, however, mock those methods frequently.
    Hence, the objects are not added to the session, which results in multiple warnings.
    Since, we test the logic and don't care about the actual data written to
    a database, we can also mock the session commit method to avoid warnings.

    Change-Id: I6c129e801f25876b03e28c863328d3ad391034ad
    Closes-Bug: #1604970
    JIRA:NCP-1835