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kvm: solve routing issues by using the same default bridge as CNI
When the kvm stage1 and the coreos stage1 are used on the same machine with a flannel CNI configuration (and likely other configurations) without a specified bridge name, different bridges will be constructed by each stage1 for the same subnet -- cni0 and kvm-cni0 -- causing traffic intended for the later-constructed bridge to be lost, as it is routed to the earlier-constructed bridge. The normal workaround is to specify a bridge name in the CNI configuration, but this fix avoids the issue altogether by making sure that cni0 is used in all cases.
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