1b95005e95
Nexthop lookup was not consireding rt_flags when doing structure comparison, which lead to an original nexthop selection when changing flags. Fix the case by adding rt_flags field into comparison and rearranging nhop_priv fields to allow for efficient matching. Fix `route change X/Y flags` case - recent changes disallowed specifying RTF_GATEWAY flag without actual gateway. It turns out, route(8) fills in RTF_GATEWAY by default, unless -interface flag is specified. Fix regression by clearing RTF_GATEWAY flag instead of failing. Fix route flag reporting in RTM_CHANGE messages by explicitly updating rtm_flags after operation competion. Add IPv4/IPv6 tests for flag-only route changes.