Peel of xmpp_socket from xmpp_stream_in after disconnect
Peel of xmpp_socket from xmpp_stream_in after disconnect

With session resume we can keep c2s process alive (and with it
xmpp_stream_in state), and we should no longer need xmpp_socket
after this, so we could free it (and parser/tls structures that it
references).

weiss/xmpp,processone/xmpp,weiss/xmpp,processone/xmpp