A real listener, the real hook handler and the real scrobble host: a session opens, a payload becomes a stamped call, the call becomes a record, and the session ends taking its accounts with it. It needs a socket where the other suites do not, because the hook and the host are HTTP clients and substituting the transport would skip exactly the code that has to agree. Change-Id: I85ca52e9d2fb015afa1ed92b2302d30d507d0ce4