routing: add rib_<add|del>_route_px() functions operating with nexthops.

routing: add rib_<add|del>_route_px() functions operating with nexthops.

This change adds public KPI to work with routes using pre-created
 nexthops, instead of using data from addrinfo structures. These
 functions will be later used for adding/deleting kernel-originated
 routes and upcoming netlink protocol.

As a part of providing this KPI, low-level route addition code has been
 reworked to provide more control over route creation or change.
 Specifically, a number of operation flags
 (RTM_F_<CREATE|EXCL|REPLACE|APPEND>) have been added, defining the
 desired behaviour the the route already exists (or not exists). This
 change required some changes in the multipath addition code, resulting
 in moving this code to route_ctl.c, rendering mpath_ctl.c empty.

Differential Revision: https://reviews.freebsd.org/D36073
MFC after:	1 month