PUT and POST uris and namespaces are inconsistent

REST and POST should deal with the same URIs and expect data formatted in the same ways. Currently, they seem to treat namespaces differently (I guess; I haven't actually be able to figure out what the actual behavior is)

The API as presented in the swagger API explorer is reasonably, sane, telling me I can either POST or PUT into URIs such as /config/toaster:toaster.

However, only PUT actually works here, and the semantics are (as correct for PUT) to wipe out everything below that URI and replace it with the new PUT data.