can't deploy ci-overclouds on Ubuntu - ensure-bridge wipes out /e/n/i

[Robert Collins]

This time, for reals a regression.

The older ensure-bridge was strictly additive - one could run ensure-bridge a second time to add a second bridge, and we depended on this for the ci-overcloud deploys - see https://etherpad.openstack.org/p/tripleo-test-cluster line 90 where we have that. I suspect it may still work for fedora network scripts, its just Ubuntu thats failed.

I know we have a next-gen thing coming, so I'll see about a quick tweak or possibly reworking our ovs configuration to vlans differently.

(because we have eth2 <- vlan25 <- br-ex, we can't use br-ex for the test network, since thats on the untagged vlan; so we need instead to have
eth2 <- br-ex <- vlan25-with-endpoint-ip and br-ex passing vlan tagged traffic directly from neutron via provider network vlan info.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/98432

[Dan Prince (dan-prince)]

As a side note it would be super nice to move foward and use the newer interfaces.d support instead of the monolithic /etc/network/interfaces file for everything...

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/98432
Committed: https://git.openstack.org/cgit/openstack/tripleo-image-elements/commit/?id=330fb42ea830f3f362b48616f73aa992aad09478
Submitter: Jenkins
Branch: master

commit 330fb42ea830f3f362b48616f73aa992aad09478
Author: Derek Higgins <email address hidden>
Date: Fri Jun 6 15:40:25 2014 +0100

    Fix sed regex from deleting old configs

    The regex used to delete old configurations was terminated with a "*",
    this caused any bridge configurations to be deleted if they had the same
    name in all but the last character.

    Also insert a blank line at the end of each config section so the sed
    only deletes the section in was intended to delete (it was deleting to
    the end of the file)

    Fixes-bug: #1327090
    Change-Id: I3a62daae94b38976f2b01cd7bc8cd0b4d8e0cd47