qemu: Init reattaching related members of pciDevice before reattach

Otherwise the device will still be bound to pci-stub driver even
it's set as "managed=yes" when do detaching. Of course, it won't
triger any driver reprobing too.

src/qemu/qemu_hotplug.c

@@ -1761,6 +1761,7 @@ int qemuDomainDetachHostPciDevice(struct qemud_driver *driver,
         pciDeviceListDel(driver->activePciHostdevs, pci);
         if (pciResetDevice(pci, driver->activePciHostdevs, NULL) < 0)
             ret = -1;
+        pciDeviceReAttachInit(pci);
         qemuReattachPciDevice(pci, driver);
         pciFreeDevice(pci);
     }