qemu: Fix IOThread pids lost after qemuProcessReconnect

IOThread pids info will lost after libvirtd restart, then
if we call pinIOThread, sched_setaffinity will be called with
pid 0, not IOThread pid. So pinIOThread cannot work normally.

Signed-off-by: Jie Wang <wangjie88.huawei.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>

src/qemu/qemu_process.c

@@ -7899,6 +7899,9 @@ qemuProcessReconnect(void *opaque)
 
     qemuDomainVcpuPersistOrder(obj->def);
 
+    if (qemuProcessDetectIOThreadPIDs(driver, obj, QEMU_ASYNC_JOB_NONE) < 0)
+        goto error;
+
     if (qemuSecurityReserveLabel(driver->securityManager, obj->def, obj->pid) < 0)
         goto error;