[Bug 289295] Host IP address ARP mapping jumps to address-less epair interface added to a bridge unexpectedly

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289295

--- Comment #14 from vova@fbsd.ru ---
With this logic `service netif start` should work properly, but it fails:

# service netif stop
Stopping Network: igb0 igb1 lo0 bridge0.
...

# service netif start
Created clone interfaces: bridge0.
ifconfig: BRDGADD igb0: File exists   <<<< already added by devd
Starting Network: igb0 igb1 vlan20 lo0 bridge0.
igb0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu
1500
       
options=4e523bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,WOL_MAGIC,VLAN_HWFILTER,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6,HWSTATS,MEXTPG>
        ether 00:e0:67:1f:29:90
        media: Ethernet autoselect
        status: no carrier
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
igb1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        description: tagged-traffic
       
options=4e527bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,WOL_MAGIC,VLAN_HWFILTER,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6,HWSTATS,MEXTPG>
        ether 00:e0:67:1f:29:91
        media: Ethernet autoselect
        status: no carrier
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
vlan20: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
       
options=4600703<RXCSUM,TXCSUM,TSO4,TSO6,LRO,RXCSUM_IPV6,TXCSUM_IPV6,MEXTPG>
        ether 00:e0:67:1f:29:91
        groups: vlan
        vlan: 20 vlanproto: 802.1q vlanpcp: 0 parent interface: igb1
        media: Ethernet autoselect
        status: no carrier
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
lo0: flags=1008049<UP,LOOPBACK,RUNNING,MULTICAST,LOWER_UP> metric 0 mtu 16384
        options=680003<RXCSUM,TXCSUM,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
        inet 127.0.0.1 netmask 0xff000000
        inet6 ::1 prefixlen 128
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3
        groups: lo
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
bridge0: flags=1008843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,LOWER_UP> metric
0 mtu 1500
        options=0
        ether 58:9c:fc:10:e4:6f
        inet 172.22.9.14 netmask 0xffffff00 broadcast 172.22.9.255
        id 00:00:00:00:00:00 priority 32768 hellotime 2 fwddelay 15
        maxage 20 holdcnt 6 proto rstp maxaddr 2000 timeout 1200
        root id 00:00:00:00:00:00 priority 32768 ifcost 0 port 0
        member: igb0 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                ifmaxaddr 0 port 1 priority 128 path cost 55
        groups: bridge
        nd6 options=9<PERFORMNUD,IFDISABLED>


so, somehow devd script should be smart enough to understand that it is run as
part of normal netif start process.

although, on boot it works somehow (devd not yet started).

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