qemu: monitor: Decrease logging verbosity

The PROBE macro used in qemuMonitorIOProcess and the VIR_DEBUG message
in qemuMonitorJSONIOProcess create a lot of logging churn when debug
logging is enabled during monitor communication.

The messages logged from the PROBE macro are rather useless since they
are reporting the partial state of receiving the reply from qemu. The
actual full reply is still logged in qemuMonitorJSONIOProcessLine once
the full message is received.

src/qemu/qemu_monitor.c

@@ -435,8 +435,8 @@ qemuMonitorIOProcess(qemuMonitorPtr mon)
 # endif
 #endif
 
-    PROBE(QEMU_MONITOR_IO_PROCESS,
-          "mon=%p buf=%s len=%zu", mon, mon->buffer, mon->bufferOffset);
+    PROBE_QUIET(QEMU_MONITOR_IO_PROCESS, "mon=%p buf=%s len=%zu",
+                mon, mon->buffer, mon->bufferOffset);
 
     if (mon->json)
         len = qemuMonitorJSONIOProcess(mon,

src/qemu/qemu_monitor_json.c

@@ -259,7 +259,10 @@ int qemuMonitorJSONIOProcess(qemuMonitorPtr mon,
         }
     }
 
+#if DEBUG_IO
     VIR_DEBUG("Total used %d bytes out of %zd available in buffer", used, len);
+#endif
+
     return used;
 }