Comment 1 for bug 1379607

In icehouse neutron-l3-agent ha ACTIVE/PASSIVE mode could work with pacemaker/corosync, however, there are some problems should be considered:
1. whether using same hostname between active and standby nodes or directly migrate virtual router from active node to standby node for neutron-l3-agent rebuilding virtual routers/firewall rules needs to be balanced with more test cases.
reference:
related bug: https://bugs.launchpad.net/openstack-manuals/+bug/1318912
chef migrate vr code: https://github.com/stackforge/cookbook-openstack-network/blob/master/files/default/neutron-ha-tool.py