Comment 4 for bug 1564447

Reviewed: https://review.openstack.org/303212
Committed: https://git.openstack.org/cgit/openstack/python-openstackclient/commit/?id=03d932ea0b3074187bfcdd9c0422a968f5f56c59
Submitter: Jenkins
Branch: master

commit 03d932ea0b3074187bfcdd9c0422a968f5f56c59
Author: reedip <email address hidden>
Date: Fri Apr 8 11:41:33 2016 +0900

    Append existing information during subnet set

    Existing values of --dns-nameserver, --allocation-pool and --houst-routes
    is currently overwritten when a user executes 'port set', but
    actually that data should be appended.
    This patch fixes the issue.

    Closes-Bug: #1564447
    Change-Id: I3dba9afa68d869abb3960b55a6880401a10eebf7