ncsid: Add service for discovering routers

This will be required for relaying egress traffic from the BMC network
once the static network configurations go away. Currently this will just
be redundant behavior with existing gateway discovery.

Change-Id: I26b3f040f0752b948b9c1d9a9110a975f8168f8a
Signed-off-by: William A. Kennington III <wak@google.com>
6 files changed