qemu: process: Refresh ejectable media tray state on VM start

Empty floppy drives start with tray in "open" state and libvirt did not
refresh it after startup. The code that inserts media into the tray then
waited until the tray was open before inserting the media and thus
floppies could not be inserted.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1326660

src/qemu/qemu_hotplug.c

@@ -300,8 +300,14 @@ qemuDomainCheckEjectableMedia(virQEMUDriverPtr driver,
         if (!info)
             goto cleanup;
 
-        if (info->tray_open && virDomainDiskGetSource(disk))
-            ignore_value(virDomainDiskSetSource(disk, NULL));
+        if (info->tray_open) {
+            if (virDomainDiskGetSource(disk))
+                ignore_value(virDomainDiskSetSource(disk, NULL));
+
+            disk->tray_status = VIR_DOMAIN_DISK_TRAY_OPEN;
+        } else {
+            disk->tray_status = VIR_DOMAIN_DISK_TRAY_CLOSED;
+        }
     }
 
     ret = 0;

src/qemu/qemu_process.c

@@ -5555,6 +5555,10 @@ qemuProcessLaunch(virConnectPtr conn,
     if (qemuProcessUpdateVideoRamSize(driver, vm, asyncJob) < 0)
         goto cleanup;
 
+    VIR_DEBUG("Updating ejectable media status");
+    if (qemuDomainCheckEjectableMedia(driver, vm, asyncJob) < 0)
+        goto cleanup;
+
     if (flags & VIR_QEMU_PROCESS_START_AUTODESTROY &&
         qemuProcessAutoDestroyAdd(driver, vm, conn) < 0)
         goto cleanup;