qemu: hotplug: Don't wait if cdrom tray is opened forcibly

Qemu always opens the tray if forced to. Skip the waiting step in such
case.

This also helps if qemu does not report the tray change event when
opening the cdrom forcibly (the documentation says that the event will
not be sent although qemu in fact does trigger it even if @force is
selceted).

This is a workaround for a qemu issue where qemu does not send the tray
change event in some cases (after migration with empty closed locked
drive) and thus renders the cdrom useless from libvirt's point of view.

Partially resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1368368

src/qemu/qemu_hotplug.c

@@ -149,8 +149,7 @@ static int
 qemuHotplugWaitForTrayEject(virQEMUDriverPtr driver,
                             virDomainObjPtr vm,
                             virDomainDiskDefPtr disk,
-                            const char *driveAlias,
-                            bool force)
+                            const char *driveAlias)
 {
     unsigned long long now;
     int rc;
@@ -175,7 +174,7 @@ qemuHotplugWaitForTrayEject(virQEMUDriverPtr driver,
 
     /* re-issue ejection command to pop out the media */
     qemuDomainObjEnterMonitor(driver, vm);
-    rc = qemuMonitorEjectMedia(qemuDomainGetMonitor(vm), driveAlias, force);
+    rc = qemuMonitorEjectMedia(qemuDomainGetMonitor(vm), driveAlias, false);
     if (qemuDomainObjExitMonitor(driver, vm) < 0 || rc < 0)
         return -1;
 
@@ -238,9 +237,9 @@ qemuDomainChangeEjectableMedia(virQEMUDriverPtr driver,
         goto cleanup;
 
     /* If the tray is present and tray change event is supported wait for it to open. */
-    if (diskPriv->tray &&
+    if (!force && diskPriv->tray &&
         virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_DEVICE_TRAY_MOVED)) {
-        rc = qemuHotplugWaitForTrayEject(driver, vm, disk, driveAlias, force);
+        rc = qemuHotplugWaitForTrayEject(driver, vm, disk, driveAlias);
         if (rc < 0)
             goto error;
     } else  {