Comment 3 for bug 1427906

The problem is actually a combination of identity-relation updates not getting fired and peer_echo not updating/removing relation settings that have been unset (since they no longer exist to be echoed - a 'querk' of our peer storage api). The solution to the second problem is to use a value e.g. "null" to represent and cleared settings so that it feeds through. I'll have patches up shortly.