Neutron l3 agent should not add metadata filter rules if metadata proxy is disabled

[Xiang Hui]

Rule "iptables -t nat -A neutron-l3-agent-INPUT -d 127.0.0.1/32 -p tcp -m tcp --dport 9697 -j ACCEPT" will be added into iptables even though Neutron metadata proxy is disabled, it's not reasonable.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/46200

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/48880

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/48880
Committed: http://github.com/openstack/neutron/commit/db4b8afd1d7b42d7c6fd4ccbe35531a7dcf4898d
Submitter: Jenkins
Branch: master

commit db4b8afd1d7b42d7c6fd4ccbe35531a7dcf4898d
Author: Hui HX Xiang <email address hidden>
Date: Sun Sep 29 19:48:51 2013 -0700

    Should not add metadata filter rules if disable metadata proxy

    The metadata filter rules should not be added into iptables if Neutron
    metadata proxy is disabled.
    This patchset fixes this issue by adding a condition when adding metadata
    filter rules to iptables.

    Closes-Bug #1224290

    Change-Id: I7f14d281c31c1828a90abac8821635773238b2d0