Revert commit 06f81c63

Commit 06f81c63 attempted to make
QEMU driver ignore the failure to relabel 'stdin_path' if it was
on NFS. The actual result was that it ignores *all* failures to
label any aspect of the VM, unless stdin_path is non-NULL and
is not on NFS.

* src/qemu/qemu_driver.c: Treat all relabel failures as terminal

src/qemu/qemu_driver.c

@@ -3912,8 +3912,7 @@ static int qemudStartVMDaemon(virConnectPtr conn,
         driver->securityDriver->domainSetSecurityAllLabel &&
         driver->securityDriver->domainSetSecurityAllLabel(driver->securityDriver,
                                                           vm, stdin_path) < 0) {
-        if (stdin_path && virStorageFileIsSharedFS(stdin_path) != 1)
-            goto cleanup;
+        goto cleanup;
     }
 
     /* Ensure no historical cgroup for this VM is lying around bogus