Neutron L3 HA router support

[Akihiro Motoki]

Neutron L3 HA router (High Availability mode) support is one of the important community topics in Juno, and the blueprint of Neutron side has been merged as FFE. This bug is to add L3 HA support to admin/project router panels.
It just adds one attribute in Neutron API and would be a small patch.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/121917

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/121917
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=f06e401adf8a787f7cf5c3e1f00d7bfa36d2dda3
Submitter: Jenkins
Branch: master

commit f06e401adf8a787f7cf5c3e1f00d7bfa36d2dda3
Author: Akihiro Motoki <email address hidden>
Date: Thu Sep 4 15:39:30 2014 +0900

    Add HA mode support for Neutron router

    HA (high availability) mode support is one of the important topics in
    Neutron Juno, and this patch adds HA router mode support to Horizon.

    This commit also changes the default value of enable_distributed_router
    in the example local_settings.py to False. In Juno release of Neutron,
    the distributed router and L3 HA mode cannot be enabled at the same
    time and only L3-agent deployment with L3 Router service plugin
    support both features. Thus I believe it is reasonable to make both
    options default to False to avoid unnecessary confusions to operators.

    Closes-Bug: #1370110
    Change-Id: I77b0292b761f08b4580846f6d58443f7df9a1f6b