The way to fetch HOST_IP in local.conf.example can lead to invalid ip

[Lajos Katona]

In local.conf.example the following line responsible for fetching the host ip:
HOST_IP=$(ip route get 8.8.8.8 | awk '{print $NF; exit}')

ip route get 8.8.8.8 can produce output like this:
$ ip route get 8.8.8.8
8.8.8.8 via 100.109.0.1 dev ens4 src 100.109.0.178 uid 1000
    cache

Thus awk '{print $NF; exit}' will produce 1000 in this case.

One solution for this can be:
- to use some other tool to fetch the IP of the host, like hostname -I | awk '{print $1}'
- As fetching the good ip can be problematic, leave HOST_IP empty, and warn the user of this example file to use the correct IP.

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.2 LTS
Release: 18.04
Codename: bionic

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/650891

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/650891
Committed: https://git.openstack.org/cgit/openstack/networking-odl/commit/?id=b5fa54c8298037763604dc36f93c642e82bd3993
Submitter: Zuul
Branch: master

commit b5fa54c8298037763604dc36f93c642e82bd3993
Author: Lajos Katona <email address hidden>
Date: Mon Apr 8 15:04:05 2019 +0200

    Fix HOST_IP fetching method in local.conf.example

    Change-Id: Iadc538c4714d6c802ae3031ffcd7cfe87bd7979d
    Closes-Bug: #1822557

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/networking-odl 15.0.0.0b1 development milestone.