Prevent new UI from hanging when creating a zvol
Seen in FreeNAS-11.2-INTERNAL72
To recreate the issue, click three dot menu under a pool. Click "Add zvol". Enter name and a size. Click "Save". The WebUI hangs there indefinitely and does not create a zvol.
Copying to investigate whether or not the same fix needs to be done in master, the code is different there so we may or may not need the fix from this ticket.