Factor qemudMonitorSend() out of qemudMonitorCommandExtra()
Factor qemudMonitorSend() out of qemudMonitorCommandExtra()

Add a little helper function to write the monitor command followed by
carriage return in a single write.

This doesn't make any real difference, but allows us to more easily
switch to using sendmsg() when using the monitor over a unix socket.

* src/qemu_conf.c: split qemudMonitorSend() out

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