namespace clean-up utility

[dan wendlandt]

The DHCP code (and soon the L3 code) uses namespaces heavily. We need a utility that helps people clean up these namespaces (and the processes running in them like dnsmasq?). this may require some name-mangling, so we know which namespaces are ours to clean-up.

[dan wendlandt (danwent)]

assigning to F-3, though this may fall over into the RC period, as it is pretty separate.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/11651

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/11651
Committed: http://github.com/openstack/quantum/commit/8e34320bbc844c42066b9499e6afff8feda1fa56
Submitter: Jenkins
Branch: master

commit 8e34320bbc844c42066b9499e6afff8feda1fa56
Author: Mark McClain <email address hidden>
Date: Mon Aug 20 10:18:01 2012 -0400

    Create utility to clean-up netns.

    Fixes bug 1035366

    Adds namespace clean up utility called quantum-netns-cleanup which can be used
    to remove old namespaces.

    The --force option can be used to remove all Quantum namespaces and any
    remaining devices. The force option is should not be run on a live Quantum
    systems. It is intended for cleaning up devstack a after running
    unstack.sh (ideally this will be added to unstack.sh in the future).

    Example cmd line when cleaning up a devstack install:
    quantum-netns-cleanup --config-file /etc/quantum/quantum.conf \
    --config-file /etc/quantum/dhcp_agent.ini --force

    Change-Id: I6cf153df21e83bff2cde816db12b22102d1ba698