zebra: Fix pass back of data from dplane through fpm pipe

zebra: Fix pass back of data from dplane through fpm pipe

A recent code change 29122bc9b8d5317f6f486f9fe61a92a854948cc5
changed the passing of data up the fpm from passing the
tableid and vrf to the sonic expected tableid contains
the vrfid.  This violates the assumptions in the code
that the netlink message passes up the tableid as the
tableid.  Additionally this code change did not modify
the rib_find_rn_from_ctx to actually properly decode
what could be passed up.  Let's just fix this and let
Sonic carry the patch as appropriate for themselves
since they are not the only users of dplane_fpm_nl.c

Signed-off-by: Donald Sharp <sharpd@nvidia.com>