The log and lock protocol don't have an extra handshake to close the
connection. Instead they just close the socket. Unfortunately that
resulted into a lot of spurious garbage logged to the system log files:

2017-03-17 14:00:09.730+0000: 4714: error : virNetSocketReadWire:1800 : End of file while reading data: Input/output error

or in the journal as:

Mar 13 16:19:33 xxxx virtlogd[32360]: End of file while reading data: Input/output error

Use the new facility in the netserverclient to suppress the IO error
report from the virNetSocket layer.