qemudDomainMemoryPeek: change ownership/selinux label on temporary file.

Otherwise qemu is unable to write to it, with the error:

libvir: QEMU error : internal error unable to execute QEMU command 'memsave': Could not open '/var/cache/libvirt/qemu/qemu.mem.RRNvLv'

src/qemu/qemu_driver.c

@@ -5536,6 +5536,8 @@ qemudDomainMemoryPeek (virDomainPtr dom,
         goto endjob;
     }
 
+    virSecurityManagerSetSavedStateLabel(qemu_driver->securityManager, vm, tmp);
+
     priv = vm->privateData;
     qemuDomainObjEnterMonitor(vm);
     if (flags == VIR_MEMORY_VIRTUAL) {