Unclean handling of socket close

This stuff appears in the DC logs quite a bit, particularly at shutdown:

[Host Controller] 10:55:26,174 ERROR [org.jboss.as.management] (Read thread for /127.0.0.1:59552) java.net.SocketException: Connection reset

I've marked this as minor as it's not worth much effort unless it continues following the switch from jboss-as-protocol to Remoting3.