76df5b1dc1
bug #1042028 Allows user to invoke L3-agent in a way that limits the agent to implementing only routers associated with a particular external network. Thus, it is possible to have a deployment with multiple external networks, since you can run one agent per external network. Also makes l3-agent pay attention to router admin_state_up field. Change-Id: Ia79d29301530718bc381c8e5a9d197de9452bce2