Use oslo util to determine network interface

[Matthew Van Dijk]

Discovered this while running tox on a mac.

The guest function get_ip_address assumes eth0 (as default, but no functions pass the arg).
This causes failures if eth0 is not the network interface used.

oslo_utils has netutils.get_my_ipv4() which determines the interface programmatically.
I propose we remove get_ip_address and use the oslo util instead.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/169564

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/169564
Committed: https://git.openstack.org/cgit/openstack/trove/commit/?id=9ae1e3776714e54bdf979cf0339285b304eec38d
Submitter: Jenkins
Branch: master

commit 9ae1e3776714e54bdf979cf0339285b304eec38d
Author: Matt Van Dijk <email address hidden>
Date: Tue Mar 31 19:26:22 2015 -0400

    Use oslo util to determine network interface

    Removes get_ip_address and use the oslo util instead.

    The guest function get_ip_address assumes eth0 (as default, but no
    functions pass the arg).
    This causes failures if eth0 is not the network interface used.
    oslo_utils has netutils.get_my_ipv4() which determines the interface
    programmatically.

    Change-Id: I6a9961df36662ccccaf46d5262b6b81306912333
    Closes-bug: #1438941