[libvirt] [PATCH] Account for defined networks when generating bridge names

[Cole Robinson]

This is the second part of the fix for rhbz 479622. If we are generating
a bridge name for a virtual network, don't collide with any bridge name
in a defined network. This patch also generates a bridge name at network
define time, if none was passed in the xml.

The downside to all this is that it won't fix things for existing
victims of the bug: if they have 2 networks with the same bridge device
in the xml, we can't intelligently remedy the situation. This patch just
helps prevent future users getting into that predicament.

Thanks,
Cole
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