qemu: Relax locking in DomainHasManagedSaveImage and DomainMonitorCommand

There is no need to hold qemu lock during the whole execution
of these two APIs.

src/qemu/qemu_driver.c

@@ -2507,7 +2507,6 @@ endjob:
 cleanup:
     if (vm)
         virDomainObjUnlock(vm);
-    qemuDriverUnlock(driver);
     return ret;
 }
 
@@ -6583,6 +6582,7 @@ qemuDomainModifyDeviceFlags(virDomainPtr dom, const char *xml,
 
     qemuDriverLock(driver);
     vm = virDomainFindByUUID(&driver->domains, dom->uuid);
+    qemuDriverUnlock(driver);
     if (!vm) {
         char uuidstr[VIR_UUID_STRING_BUFLEN];
         virUUIDFormat(dom->uuid, uuidstr);
@@ -12688,6 +12688,7 @@ static int qemuDomainMonitorCommand(virDomainPtr domain, const char *cmd,
 
     qemuDriverLock(driver);
     vm = virDomainFindByUUID(&driver->domains, domain->uuid);
+    qemuDriverUnlock(driver);
     if (!vm) {
         char uuidstr[VIR_UUID_STRING_BUFLEN];
         virUUIDFormat(domain->uuid, uuidstr);
@@ -12700,9 +12701,9 @@ static int qemuDomainMonitorCommand(virDomainPtr domain, const char *cmd,
         virReportError(VIR_ERR_OPERATION_INVALID,
                        "%s", _("domain is not running"));
         goto cleanup;
-   }
+    }
 
-    if (qemuDomainObjBeginJobWithDriver(driver, vm, QEMU_JOB_MODIFY) < 0)
+    if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0)
         goto cleanup;
 
     if (!virDomainObjIsActive(vm)) {
@@ -12717,9 +12718,9 @@ static int qemuDomainMonitorCommand(virDomainPtr domain, const char *cmd,
 
     hmp = !!(flags & VIR_DOMAIN_QEMU_MONITOR_COMMAND_HMP);
 
-    qemuDomainObjEnterMonitorWithDriver(driver, vm);
+    qemuDomainObjEnterMonitor(driver, vm);
     ret = qemuMonitorArbitraryCommand(priv->mon, cmd, result, hmp);
-    qemuDomainObjExitMonitorWithDriver(driver, vm);
+    qemuDomainObjExitMonitor(driver, vm);
 
 endjob:
     if (qemuDomainObjEndJob(driver, vm) == 0) {
@@ -12729,7 +12730,6 @@ endjob:
 cleanup:
     if (vm)
         virDomainObjUnlock(vm);
-    qemuDriverUnlock(driver);
     return ret;
 }