When bridging is enabled and an ARP request is recieved on a member interface, the arp code will search all local interfaces for a match. This triggers a kernel log if the bridge has been assigned an address.
When bridging is enabled and an ARP request is recieved on a member interface,
the arp code will search all local interfaces for a match. This triggers a
kernel log if the bridge has been assigned an address.

arp: ac:de:48:18:83:3d is using my IP address 192.168.0.142!

bridge0: flags=8041<UP,RUNNING,MULTICAST> mtu 1500
        inet 192.168.0.142 netmask 0xffffff00
        ether ac:de:48:18:83:3d

Silence this warning for 6.0 to stop unnecessary bug reports, the code will need
to be reworked.

Approved by:	mlaier (mentor)
MFC after:	3 days

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