Convert QEMU driver to use virLogProbablyLogMessage

The current QEMU code for skipping log messages only skips over
'debug' message, switch to virLogProbablyLogMessage to make sure
it skips over all of them

src/qemu/qemu_process.c

@@ -1434,19 +1434,11 @@ qemuProcessReadLogOutput(virDomainObjPtr vm,
 {
     int retries = (timeout*10);
     int got = 0;
-    char *debug = NULL;
     int ret = -1;
     char *filter_next = buf;
 
     buf[0] = '\0';
 
-    /* This relies on log message format generated by virLogFormatString() and
-     * might need to be modified when message format changes. */
-    if (virAsprintf(&debug, ": %d: debug : ", vm->pid) < 0) {
-        virReportOOMError();
-        return -1;
-    }
-
     while (retries) {
         ssize_t func_ret, bytes;
         int isdead = 0;
@@ -1473,7 +1465,7 @@ qemuProcessReadLogOutput(virDomainObjPtr vm,
         /* Filter out debug messages from intermediate libvirt process */
         while ((eol = strchr(filter_next, '\n'))) {
             *eol = '\0';
-            if (strstr(filter_next, debug)) {
+            if (virLogProbablyLogMessage(filter_next)) {
                 memmove(filter_next, eol + 1, got - (eol - buf));
                 got -= eol + 1 - filter_next;
             } else {
@@ -1510,7 +1502,6 @@ qemuProcessReadLogOutput(virDomainObjPtr vm,
                    what, buf);
 
 cleanup:
-    VIR_FREE(debug);
     return ret;
 }