server: introspect ring and channels via /tool/xenstored/transport/<scheme>/<idx>
server: introspect ring and channels via /tool/xenstored/transport/<scheme>/<idx>

It's cleaner to mount the ring introspection data in a different
place to the connection data (watch queues etc).

Signed-off-by: David Scott <63c9eb0ea83039690fefa11afe17873ba8278a56@eu.citrix.com>

mirage/ocaml-xenstore-server,mirage/ocaml-xenstore-server,djs55/ocaml-xenstore-server