ncsid: Remove unused services

We no longer need IPv4 support or any of the neighbor finding logic, as
we have all of the neighbor information updated via the primary RA from
the router.

Tested: Ran on a lab and prod machine to verify the networking behavior
is still consistent and gateway information is updated accurately.

Change-Id: I0e247291ae3a1f98064a3bc9a94b28d9a2223843
Signed-off-by: William A. Kennington III <wak@google.com>
11 files changed