Since we are using random ethernet addresses for the bridge, it is possible that we might have address collisions, so make sure that this hardware address isn't already in use on another bridge.
Since we are using random ethernet addresses for the bridge, it is possible
that we might have address collisions, so make sure that this hardware address
isn't already in use on another bridge.

Submitted by:	csjp
MFC after:	1 month

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