BGP peers remain in active while rdnbrd is running.

BGP peers remain in active while rdnbrd is running.

Signed-off-by: Daniel Walton <dwalton@cumulusnetworks.com>
Reviewed-by:   Donald Sharp <sharpd@cumulusnetworks.com>
Ticket: CM-7789, CM-8806

If the route-map for an "ip import-table" denied a route it only flagged
the nexthop as inactive, it did not actually delete the route. This
breaks all directly connected EBGP peers that peer via IPv4 because NHT
finds this /32 with an inactive nexthop.