rewrite_node_address_for_bridge() should set IPv6 preferences even if there is no ri
rewrite_node_address_for_bridge() should always set IPv6 preferences, even if there is only one of ri or rs. And it should always warn about them.
This goes back to commit c213f277cde in 0.2.8.2-alpha and commit 9e9edf71f7d in 0.2.4.5-alpha.
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