[magnum] dev-quickstart should work for Rhel/fedora

[Surojit Pathak]

As we follow the setup instructions in dev-quickstart[1] for running devstack on a fedora/rhel environment, we land up in a
scenario, where the kube/swarm instances do not have access to the internet.

From the kube-instance, we can reach the br-ex but not the eth0-ip of the devstack host or anything outside.

Debugging reveals that the iptables MASQUERADE rule is set against outgoing interface instead of eth0.

dev-quickstart steps need to have a fix for this.

[1] - https://github.com/openstack/magnum/blob/master/doc/source/dev/dev-quickstart.rst

[Surojit Pathak (suro-patz)]

This is observed by linevan and sdake also confirmed this on IRC[1] - thus confirmed.
Proposing a fix for this - thus assigning to myself.

[1] - http://eavesdrop.openstack.org/irclogs/%23openstack-containers/%23openstack-containers.2015-07-17.log.html

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/203287
Committed: https://git.openstack.org/cgit/openstack/magnum/commit/?id=85cf959e33457f4084e601f6f8854af44a17f680
Submitter: Jenkins
Branch: master

commit 85cf959e33457f4084e601f6f8854af44a17f680
Author: Surojit Pathak <email address hidden>
Date: Fri Jul 17 23:12:41 2015 +0000

    Derive the public interface

    Identifying the device through which the host has internet connectivity.

    Closes-Bug: #1475806
    Change-Id: I6a808237193e00ea3d649bc6609f6b8b01de2f09