[Bug 248005] nd6 initializes nd_ifinfo->maxmtu = 0 on newly inserted network interfaces

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248005

--- Comment #6 from Andrey V. Elsukov <ae at FreeBSD.org> ---
How it worked before patch:
# ifconfig vlan1000 create vlandev mce3 vlan 1000 up
# ifconfig vlan1000
vlan1000: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 9000
       
options=1c680003<RXCSUM,TXCSUM,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6,NOMAP,TXTLS4,TXTLS6>
        ether 24:8a:07:b4:32:43
        inet6 fe80::268a:7ff:feb4:3243%vlan1000 prefixlen 64 scopeid 0x8
        groups: vlan
        vlan: 1000 vlanpcp: 0 parent interface: mce3
        media: Ethernet autoselect <full-duplex,rxpause,txpause> (100GBase-CR4
<full-duplex,rxpause,txpause>)
        status: active
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
# netstat -Wrnf inet6 | grep vlan1000
fe80::%vlan1000/64                link#8                        U          11  
9000 vlan1000
fe80::268a:7ff:feb4:3243%vlan1000 link#3                        UHS         1 
16384      lo0
# ndp -i vlan1000
linkmtu=0, maxmtu=0, curhlim=64, basereachable=30s0ms, reachable=27s,
retrans=1s0ms
Flags: nud auto_linklocal 

After this patch:
# netstat -Wrnf inet6 | grep vlan1000
fe80::%vlan1000/64                link#8                        U          11  
1500 vlan1000
fe80::268a:7ff:feb4:3243%vlan1000 link#3                        UHS         1 
16384      lo0
# ndp -i vlan1000
linkmtu=0, maxmtu=1500, curhlim=64, basereachable=30s0ms, reachable=18s,
retrans=1s0ms
Flags: nud auto_linklocal

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