bgpd: Reinstall aggregated routes if using route-maps and it was changed

bgpd: Reinstall aggregated routes if using route-maps and it was changed

Without this change when we change the route-map, we never reinstall the route
if the route-map has changed.

We checked only some attributes like aspath, communities, large-communities,
extended-communities, but ignoring the rest of attributes.

With this change, let's check if the route-map has changed.

bgp_route_map_process_update() is triggered on route-map change, and we set
`changed` to true, which treats aggregated route as not the same as it was before.

Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>