New event proxy. This proxy is used in lieu of Elvin clustering or
federation, which is not supported in the version we have source to. Basically, we run an elvind on each node. The proxy on each node subscribes to all events for that node from the boss elvind, and hands them to the local elvind, Each client on the node subscribes to the local elvind, and gets its events via the proxy. This should reduce the number of connections to boss, and makes it possible to run agents inside each virtual node without an FD explosion on boss.