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routing: populate fibs with interface routes after growing net.fibs.

Description

routing: populate fibs with interface routes after growing net.fibs.

Currently it is possible to extend number of fibs in runtime, but this
functionality is of limited use when net.add_addrs_all_fibs is
non-zero, as the routing tables are created empty.

This change automatically populate newly-created fibs with the kernel-originated
interface routes (filtered by RTF_PINNED flag) if net.add_addrs_all_fibs
is set.

-> sysctl net.add_addr_allfibs=1
net.add_addr_allfibs: 0 -> 1
-> sysctl net.fibs
net.fibs: 2
-> sysctl net.fibs=3
net.fibs: 2 -> 3

BEFORE:
-> setfib 2 netstat -rn
Routing tables (fib: 2)

AFTER:
-> setfib 2 netstat -rn
Routing tables (fib: 2)

Internet:
Destination        Gateway            Flags     Netif Expire
10.0.0.0/24        link#1             U        vtnet0
10.0.0.5           link#1             UHS         lo0
127.0.0.1          link#2             UH          lo0

Internet6:
Destination                       Gateway                       Flags     Netif Expire
::1                               link#2                        UHS         lo0
2a01:4f9:3a:fa00::/64             link#1                        U        vtnet0
2a01:4f9:3a:fa00:5054:ff:fe15:4a3b link#1                       UHS         lo0
fe80::%vtnet0/64                  link#1                        U        vtnet0
fe80::5054:ff:fe15:4a3b%vtnet0    link#1                        UHS         lo0
fe80::%lo0/64                     link#2                        U           lo0
fe80::1%lo0                       link#2                        UHS         lo0

Differential Revision: https://reviews.freebsd.org/D36075
MFC after: 1 month

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