Comment 13 for bug 1508442

Reviewed: https://review.openstack.org/262099
Committed: https://git.openstack.org/cgit/openstack/magnum/commit/?id=6ac4ce2eb1c5090e4bf35f1c5eab9e66f6af4f8f
Submitter: Jenkins
Branch: master

commit 6ac4ce2eb1c5090e4bf35f1c5eab9e66f6af4f8f
Author: Wanlong Gao <email address hidden>
Date: Tue Dec 29 09:23:53 2015 +0800

    Python 3 deprecated the logger.warn method in favor of warning

    Python 3 deprecated the logger.warn method, see:
    https://docs.python.org/3/library/logging.html#logging.warning, so we
    prefer to use warning to avoid DeprecationWarning.

    Closes-Bug: 1508442
    Change-Id: I245d24b30e783f1c6dcec1b425d78d271edff49b