QPID-4967 - Updates to the router
 - The router module now tracks other router nodes (neighbors and non-neighbors)
 - Tracked nodes are communicated to the router_node.c fast-path


git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1509415 13f79535-47bb-0310-9956-ffa450edef68